933 Adjectives That Start With O with Interesting Examples

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Posted on Last updated: October 16, 2023

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Adjectives That Start With O! Are you searching for the list of common adjectives beginning with letter O? Here is the right page for you to look for a useful list of adjectives starting with an O with ESL infographic.

Adjectives That Start With O

Common Adjectives Begining with O

Obdurate
Obedient
Obese
Objective
Oblate
Obligate
Obligated
Obligatory
Obliged
Oblique
Oblivious
Oblong
Obnoxious
Obscene
Obscure
Observable
Observant
Observed
Observing
Obsessed
Obsessional
Obsessive
Obsolescent
Obsolete
Obstetric
Obstetrical
Obstinate
Obstructed
Obstructive
Obtainable
Obtrusive
Obtuse
Obviating
Obvious
Occasional
Occidental
Occipital
Occlusive
Occult
Occupational
Occupied
Occurrent
Oceanic
Ocellated
Ocher
Ochre
Octagonal
Octal
Octangular
Octuple
Ocular
Odd
Oddish
Odious
Odorless
Odorous
Odourless
Oecumenic
Off
Offbeat
Offenceless
Offended
Offending
Offenseless
Offensive
Offhand
Official
Officious
Offish
Offshore
Offside
Offsides
Offstage
Old
Olden
Older
Oldish
Oldline
Oleaceous
Oleaginous
Olfactive
Olfactory
Olive
Olivelike
Olympian
Olympic
Omani
Ominous
Omissible
Omissive
Omnibus
Omnipresent
Omniscient
Oncologic
Oncoming
One
Oneiric
Onerous
Onetime
Ongoing
Online
Only
Onomastic
Onshore
Onside
Onstage
Ontogenetic
Ontological
Onymous
Opalescent
Opaline
Opaque
Open
Opencast
Opencut
Opened
Openhanded
Openhearted
Opening
Operable
Operant
Operatic
Operating
Operational
Operationalist
Operative
Operculate
Operculated
Operose
Ophthalmic
Opinionated
Opponent
Opportune
Opportunist
Opposable
Opposed
Opposing
Opposite
Oppositive
Oppressed
Oppressive
Opprobrious
Optative
Optic
Optical
Optimal
Optimistic
Optimum
Optional
Opulent
Oracular
Oral
Orange
Orangish
Oratorical
Orbicular
Orbiculate
Orbital
Orbitual
Orchestral
Orchestrated
Ordained
Ordered
Orderly
Ordinal
Ordinary
Organic
Organised
Organismal
Organismic
Organized
Orgiastic
Oriental
Orientated
Orientating
Oriented
Orienting
Original
Originative
Ornamental
Ornate
Ornery
Orotund
Orphaned
Orphic
Orthodontic
Orthodox
Orthogonal
Orthographic
Orthopaedic
Orthoptic
Orthostatic
Orwellian
Oscillating
Oscillatory
Oscine
Oscitant
Osmotic
Osseous
Ossicular
Ossiculate
Ossiferous
Ossified
Osteal
Ostensible
Ostensive
Ostentatious
Other
Otherwise
Otherworldly
Ototoxic
Ottoman
Outback
Outboard
Outbound
Outbred
Outcast
Outclassed
Outdated
Outdoor
Outdoorsy
Outer
Outermost
Outfitted
Outflowing
Outgoing
Outlandish
Outlaw
Outlined
Outmoded
Outmost
Outrageous
Outre
Outright
Outside
Outsize
Outsized
Outspoken
Outspread
Outstanding
Outward
Oval
Ovarian
Ovate
Over
Overactive
Overage
Overaged
Overall
Overarm
Overawed
Overbearing
Overblown
Overbold
Overbusy
Overcareful
Overcast
Overcautious
Overconfident
Overcritical
Overcurious
Overdelicate
Overdone
Overdressed
Overdue
Overeager
Overemotional
Overexcited
Overfamiliar
Overflowing
Overfond
Overfull
Overgenerous
Overgreedy
Overgrown
Overhand
Overhanded
Overhasty
Overhead
Overheated
Overjealous
Overjoyed
Overladen
Overland
Overlarge
Overloaded
Overlooked
Overlying
Overmodest
Overmuch
Overnice
Overnight
Overpowering
Overpriced
Overprotective
Overproud
Overreaching
Overrefined
Overriding
Overripe
Oversea
Overseas
Oversensitive
Overserious
Oversewn
Oversexed
Overshot
Oversize
Overstated
Overstuffed
Oversubscribed
Oversuspicious
Overt
Overturned
Overvaliant
Overweight
Overwhelming
Overzealous
Ovoid
Ovular
Owlish
Owned
Ownerless
Oxalic
Oxidative
Oxidized

Positive Adjectives that Start with O

Adjectives	Examples
Open-minded	She was open-minded about trying new foods.
Optimistic	He had an optimistic outlook on life.
Outstanding	The team’s performance was outstanding.
Original	The artist’s style was very original.
Observant	The detective was very observant and noticed every detail.
Orderly	The files were arranged in an orderly manner.
Organized	She was very organized and always had a plan.
Outgoing	He was a very outgoing person and made friends easily.
Opportune	The meeting came at an opportune time.
Optimized	The website was optimized for mobile devices.
Omnipotent	The ruler believed he was omnipotent and had complete control.
Overjoyed	She was overjoyed to receive the award.
Oasis-like	The garden was an oasis-like retreat in the middle of the city.
On-the-ball	The assistant was always on-the-ball and never missed a deadline.
One-of-a-kind	The antique was one-of-a-kind and couldn’t be replicated.
Onward	The project moved onward with the team’s hard work.
Out-of-sight	The view from the top of the mountain was out-of-sight.
Over-the-moon	She was over-the-moon with excitement about her upcoming trip.
On-target	The sales team’s predictions were on-target with their projections.

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Negative Adjectives that Start with O

Adjectives	Examples
Obnoxious	His obnoxious behavior at the party made everyone uncomfortable.
Offensive	His remarks about women were highly offensive.
Ominous	The dark clouds in the sky were an ominous sign of an approaching storm.
Oppressive	The oppressive heat made it difficult to breathe.
Objectionable	The movie contained objectionable content that some viewers found offensive.
Obdurate	Despite the evidence against him, he remained obdurate and refused to admit guilt.
Obsolete	This computer is now obsolete and needs to be replaced.
Obstinate	She is so obstinate that she refuses to consider any other point of view.
Offensive	The offensive smell coming from the trash can was unbearable.
Off-putting	His strange behavior was off-putting and made people uncomfortable.
One-sided	The newspaper article was one-sided and did not present a balanced view.
Opprobrious	The politician’s opprobrious comments caused a scandal.
Outrageous	The price of the concert tickets was outrageous.
Overbearing	His overbearing personality made it difficult for others to work with him.

Descriptive Adjectives that Start with O

Adjectives	Examples
Obedient	The dog was obedient and followed all of its owner’s commands.
Obese	The doctor warned the patient that they were becoming obese.
Objective	The journalist’s reporting was praised for being objective.
Obliging	The obliging waiter quickly brought us more water.
Observant	The observant detective noticed a small clue at the crime scene.
Obsessive	The artist was obsessive about getting every detail just right.
Obsolete	The old computer equipment was now obsolete and needed replacing.
Obstinate	The obstinate child refused to eat their vegetables.
Obtuse	The obtuse angle was difficult for the students to understand.
Obvious	It was obvious that the politician was lying.
Oily	The pizza was so oily that the napkins were saturated.
Okay	The food was just okay, nothing special.
Ominous	The dark clouds on the horizon were ominous signs of a storm.
Ongoing	The investigation into the fraud was still ongoing.
Open	The open window allowed a cool breeze to flow into the room.
Operatic	The singer’s powerful voice was perfect for operatic performances.
Opinionated	The opinionated boss never listened to other people’s ideas.
Opportunistic	The opportunistic salesman took advantage of the customer’s confusion.
Optimistic	The optimistic student was confident they would do well on the test.
Optional	The extra credit assignment was optional for the students.
Orange	The orange sunset was a beautiful sight to behold.
Orderly	The books on the shelf were arranged in a very orderly fashion.
Ordinary	The food at the restaurant was ordinary, but filling.
Organic	The farmer grew organic vegetables without any chemicals.
Organized	The organized teacher had a lesson plan for every class.
Oriental	The oriental rug added a touch of elegance to the room.
Ornamental	The ornamental flowers in the garden were in full bloom.
Ornate	The ornate decorations on the cake were almost too beautiful to eat.
Orthodox	The orthodox priest adhered strictly to the traditional religious practices.
Ossified	The ossified bones were fragile and easily broken.
Outgoing	The outgoing personality of the host made the party more enjoyable.
Outrageous	The outrageous price of the designer shoes was shocking.
Outstanding	The outstanding performance of the team earned them a trophy.
Oval	The oval-shaped pool was perfect for doing laps.
Overbearing	The overbearing boss always wanted things done his way.
Overdue	The library book was already two weeks overdue.
Overjoyed	The overjoyed parents hugged their newborn baby.
Overwhelming	The overwhelming response to the charity fundraiser was heartwarming.

O Adjectives to Describe A Person

Adjectives	Examples
Observant	She’s very observant and noticed the small details that everyone else missed.
Open-minded	He’s very open-minded and always willing to listen to other people’s opinions.
Optimistic	Despite the challenges, she remained optimistic and believed in herself.
Outgoing	He’s very outgoing and enjoys meeting new people and trying new things.
Original	Her artwork is so original and unique that it stands out from the rest.
Organized	He’s very organized and keeps everything in its place, making it easy to find what he needs.
Objective	He’s very objective and makes decisions based on facts and evidence.
Outstanding	She’s an outstanding student who always puts in extra effort to excel.
Obliging	He’s very obliging and always willing to lend a helping hand to those in need.
Observative	She’s very observative and can spot things that others may miss.
On-task	He’s always on-task and never gets distracted from his work.
One-of-a-kind	Her personality is one-of-a-kind, and she stands out from the crowd.
Obdurate	He’s so obdurate that he refuses to listen to anyone else’s opinion.
Obtuse	He’s so obtuse that he can’t understand even the simplest concepts.
Obstinate	She’s so obstinate that she refuses to change her mind, even when presented with evidence.
Offbeat	His sense of humor is a bit offbeat, but it always makes people laugh.
Offensive	His comments were so offensive that they hurt everyone’s feelings.
Old-fashioned	He has an old-fashioned sense of style and prefers classic clothes over trendy ones.
Omnipotent	He acted like he was omnipotent and could control everything around him.
Obedient	She’s very obedient and always follows the rules and instructions given to her.

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A Complete List of Adjectives Starting with O

Oafish
Oak
Oaken
Oaten
Obdurant
Obdurate
Obedible
Obedient
Obediential
Obedt
Obeisant
Obeisaunt
Obese
Obfuscatory
Obituary
Object-based
Object-oriented
Objectionable
Objectional
Objective
Objectless
Objectual
Oblate
Oblationary
Obligate
Obligated
Obligational
Obligatory
Obliged
Obliging
Oblike
Oblimin
Oblique
Obliquid
Oblite
Obliterable
Obliterated
Obliterative
Oblivious
Oblong
Obnoxious
Obscene
Obscurant
Obscure
Obsequious
Observable
Observant
Observational
Observed
Observing
Obsessed
Obsessional
Obsessive
Obsignatory
Obsolescent
Obsolete
Obsoleter
Obstacle-ridden
Obstacular
Obstetric
Obstetrical
Obstetricious
Obstetrick
Obstinant
Obstinate
Obstreperous
Obstructed
Obstructive
Obstruent
Obtainable
Obtrusive
Obtuse
Obtuse-angled
Obverse
Obviating
Obvious
Occasional
Occidental
Occipital
Occluded
Occlusal
Occluse
Occlusional
Occlusive
Occulent
Occulomotor
Occult
Occultic
Occultistic
Occultive
Occultural
Occupational
Occupiable
Occupied
Occurrent
Ocean-going
Oceanic
Oceanward
Ocellar
Ocellated
Ocher
Ochre
Ochreous
Ochrous
Ocreate
Octabasic
Octacore
Octacosanoic
Octacyclic
Octagonal
Octahedral
Octal
Octameric
Octangular
Octanoic
Octogenarian
Octogynous
Octoic
Octoid
Octolateral
Octolocular
Octonary
Octonionic
Octonocular
Octopaminergic
Octopartite
Octopean
Octopetalous
Octopian
Octopic
Octopine
Octoploid
Octopodal
Octopodous
Octopoid
Octopoidal
Octopolar
Octosyllabic
Octuple
Ocular
Odd
Odd-looking
Odd-toed
Oddish
Odds-on
Odic
Odiferous
Odinic
Odious
Odobenine
Odometric
Odometrical
Odontoid
Odorant
Odoriferous
Odorless
Odorous
Odourful
Odourless
Oecumenic
Oecumenical
Oedematous
Oedipal
Oenological
Oenophilic
Oestral
Oestrogenic
Oestrous
Off
Off-air
Off-base
Off-beam
Off-book
Off-broadway
Off-campus
Off-center
Off-colour
Off-field
Off-guard
Off-hand
Off-key
Off-kilter
Off-limits
Off-line
Off-peak
Off-piste
Off-put
Off-putting
Off-road
Off-sale
Off-screen
Off-site
Off-street
Off-target
Off-the-ball
Off-the-cuff
Off-the-peg
Off-the-rack
Off-the-record
Off-the-shelf
Off-the-shoulder
Off-the-wall
Off-track
Off-white
Offbeat
Offduty
Offenceless
Offended
Offending
Offenseless
Offensive
Offhand
Offhanded
Official
Officiary
Officinal
Officious
Offish
Offline
Offputting
Offscreen
Offshore
Offside
Offsides
Offsite
Offstage
Oft-repeated
Ogival
Ogreish
Ohmic
Oily
Ok
Okay
Old
Old-fashioned
Old-growth
Old-hat
Old-line
Old-maidish
Old-school
Old-time
Old-world
Olde
Olden
Older
Oldest
Oldfashioned
Oldish
Oldline
Ole
Oleaceous
Oleaginous
Oleanolic
Olefinic
Oleic
Olent
Oleochemical
Oleographic
Oleophilic
Oleophobic
Oleoresinous
Oleose
Oleraceous
Olfactive
Olfactory
Oligaemic
Oligarchic
Oligarchical
Oligomeric
Oligopolistic
Oligosaline
Oligosemic
Oligosynaptic
Oligotrichous
Oligotrophic
Oliguric
Olivary
Olive
Olivelike
Olympian
Olympic
Omakase
Omani
Omasal
Ominous
Omissible
Omissive
Ommatidial
Omnibus
Omnipotent
Omnipresent
Omniscient
Omnivorous
Omohyoidean
Omophagic
Omophagous
Omosternal
Omotic
Omphacine
Omphacitic
Omphalic
Omphalinoid
On
On-air
On-camera
On-campus
On-going
On-hand
On-line
On-off
On-road
On-scene
On-screen
On-site
On-stage
On-the-job
On-the-spot
Onanistic
Once-removed
Oncogenetic
Oncogenic
Oncogenomic
Oncologic
Oncological
Oncoming
One
One-armed
One-day
One-eighth
One-eyed
One-fifth
One-fourth
One-gallused
One-half
One-handed
One-hour
One-legged
One-ninth
One-note
One-off
One-on-one
One-piece
One-pot
One-quarter
One-seventh
One-shot
One-sided
One-sixth
One-stop
One-tenth
One-third
One-time
One-to-one
One-touch
One-track
One-way
Oneiric
Onerous
Onesided
Onetime
Ongoing
Onioned
Onionless
Onionlike
Oniony
Oniric
Onirocritic
Onkus
Onlest
Onlie
Online
Onlooking
Only
Onomastic
Onomatopoeic
Onrushing
Onscreen
Onshore
Onside
Onsite
Onstage
Ontic
Ontogenetic
Ontologic
Ontological
Onward
Onygenaceous
Onymous
Onyx
Oo
Oob
Oofy
Oolitic
Oozy
Opacating
Opacifiable
Opacous
Opacular
Opalescent
Opaline
Opaque
Open
Open-air
Open-and-shut
Open-armed
Open-book
Open-ended
Open-eyed
Open-faced
Open-handed
Open-hearted
Open-hearth
Open-minded
Open-mouthed
Open-plan
Openable
Opencast
Opencut
Opened
Openhanded
Openhearted
Opening
Opensightly
Opensource
Opephoroid
Operable
Operant
Operatic
Operating
Operational
Operationalist
Operative
Opercular
Operculate
Operculated
Operose
Ophidian
Ophiolitic
Ophthalmic
Opiate
Opinionated
Oppilative
Opponent
Opportune
Opportunist
Opportunistic
Opposable
Opposed
Opposing
Opposite
Oppositional
Oppositive
Oppressed
Oppressional
Oppressive
Opprobrious
Opsonic
Optative
Opthalmic
Optic
Optical
Optimal
Optimific
Optimistic
Optimum
Optional
Optoelectronic
Optokinetic
Optomotor
Optospintronic
Optothermal
Optotypic
Optronic
Opulent
Opuntiaceous
Oracular
Oral
Orange
Orangey
Orangish
Orangy
Oratorial
Oratorian
Oratorical
Orbicular
Orbiculate
Orbital
Orbitary
Orbitual
Orbless
Orblike
Orchestral
Orchestrated
Orcish
Ordained
Ordeal
Orderable
Ordered
Orderly
Ordinal
Ordinary
Ordinate
Ordurous
Orectic
Oregonian
Organdy
Organic
Organised
Organismal
Organismic
Organizational
Organized
org*smic
Orgastic
Orgiastic
Orgulous
Orient
Oriental
Orientated
Orientating
Orientational
Oriented
Orienting
Origenian
Origenist
Origenistic
Originable
Original
Originary
Originative
Originless
Orinasal
Orinocan
Orkish
Ornamental
Ornate
Ornery
Ornithogenic
Ornithological
Ornithophilous
Orogastric
Orogenic
Orogenital
Orographic
Orographical
Orolabial
Orolingual
Orological
Oromucosal
Oronasal
Oroqen
Orosensory
Orosirian
Orotund
Orphaned
Orphic
Orthodontic
Orthodox
Orthoepic
Orthogenetic
Orthogenic
Orthognathic
Orthogonal
Orthograde
Orthographic
Orthologous
Orthometric
Orthopaedic
Orthopedic
Orthoptic
Orthorhombic
Orthostatic
Orthotopic
Orthotropic
Orwellian
Os
Os-specific
Oscillating
Oscillatory
Oscine
Oscitant
Osculating
Osculatory
Osmobiotic
Osmolar
Osmometric
Osmotic
Osseous
Ossicular
Ossiculate
Ossiferous
Ossified
Ossom
Osteal
Ostensible
Ostensive
Ostentatious
Osteoarthritic
Osteogenetic
Osteogenic
Osteoid
Osteopathic
Osteoporotic
Ostial
Ostrich-like
Other
Other-worldly
Otherwise
Otherworldly
Otic
Otiose
Otoscopic
Ototoxic
Otter
Otterless
Otterlike
Ottoman
Our
Out
Out-and-out
Out-of-body
Out-of-character
Out-of-context
Out-of-court
Out-of-date
Out-of-order
Out-of-pocket
Out-of-print
Out-of-service
Out-of-state
Out-of-town
Out-of-work
Outback
Outboard
Outbound
Outbred
Outcast
Outclassed
Outcoming
Outcut
Outdacious
Outdate
Outdated
Outdoor
Outdoorsy
Outer
Outermost
Outfitted
Outflowing
Outflung
Outgoing
Outgunned
Outjutting
Outland
Outlandish
Outlaw
Outlawed
Outlined
Outlying
Outmoded
Outmost
Out of Work
Outraged
Outrageous
Outre
Outright
Outshore
Outside
Outsize
Outsized
Outspoken
Outspread
Outstanding
Outward
Ouvrierist
Oval
Ovaloid
Ovarian
Ovate
Ovation
Oven-proof
Ovenproof
Over
Over-assertive
Over-educated
Over-elaborate
Over-fond
Over-polite
Over-rated
Over-reactive
Over-ripe
Over-sensitive
Over-the-counter
Over-the-top
Over-zealous
Overabundant
Overachiever
Overachieving
Overactive
Overage
Overaged
Overaggressive
Overalert
Overall
Overalled
Overambitious
Overanxious
Overapt
Overarm
Overattentive
Overawed
Overbanked
Overbearing
Overblown
Overbold
Overbooked
Overbreathed
Overburdened
Overbusy
Overcareful
Overcast
Overcautious
Overcharged
Overcivilized
Overclad
Overclaimed
Overclear
Overclose
Overclothed
Overcluttered
Overcoached
Overcoated
Overcoatless
Overcoming
Overcommitted
Overcomplicated
Overconcerned
Overconfident
Overconscientious
Overconscious
Overconsiderate
Overcooked
Overcounted
Overcritical
Overcrowded
Overcurious
Overdamped
Overdelicate
Overdependent
Overdetermined
Overdeveloped
Overdocumented
Overdominant
Overdone
Overdoped
Overdosed
Overdramatic
Overdressed
Overdue
Overeager
Overeducated
Overemotional
Overemphatic
Overenthusiastic
Overexcitable
Overexcited
Overexerted
Overexerting
Overexposed
Overextended
Overfamiliar
Overfatigued
Overfed
Overflowing
Overfocused
Overfond
Overforceful
Overforested
Overforward
Overfragrant
Overfraught
Overfree
Overfreighted
Overfrequent
Overfriendly
Overfriezed
Overfruitful
Overful
Overfulfilled
Overfull
Overfurnished
Overfussy
Overgenerous
Overgreedy
Overgrown
Overhand
Overhanded
Overhasty
Overhead
Overheated
Overhyped
Overinclusive
Overindebted
Overintense
Overinvested
Overinvolved
Overionized
Overish
Overjealous
Overjittery
Overjoyed
Overjoyous
Overjubilant
Overjust
Overkeen
Overladen
Overland
Overlarge
Overlayered
Overloaded
Overlookable
Overlooked
Overly
Overlying
Overmastering
Overmighty
Overmodest
Overmotivated
Overmuch
Overmuscled
Overneat
Overnew
Overnice
Overnight
Overnighter
Overoptimistic
Overpessimistic
Overplayful
Overpowering
Overpriced
Overproof
Overprotective
Overproud
Overqualified
Overraced
Overracked
Overrank
Overrash
Overrated
Overreaching
Overreactive
Overread
Overready
Overrefined
Overriding
Overripe
Oversea
Overseas
Oversensitive
Overserious
Oversewn
Oversexed
Overshot
Oversimplistic
Oversize
Over Sized
Oversized
Overslow
Oversmoothed
Oversnowed
Oversocialized
Oversoft
Oversolar
Oversolicitous
Oversophisticated
Oversparred
Overspecific
Overspeeding
Overstated
Oversteered
Overstimulated
Overstrung
Overstuffed
Oversubscribed
Oversuspicious
Overt
Overtight
Overtired
Overtouristed
Overtroubled
Overtrusting
Overturnable
Overturned
Overuniform
Overvaliant
Overwater
Overweening
Overweight
Overwhelmed
Overwhelming
Overworked
Overwrought
Overzealous
Ovid
Oviform
Ovigerous
Oviparous
Ovoid
Ovular
Ovulational
Ower
Owing
Owlish
Own
Owned
Ownerless
Ox-eyed
Oxalic
Oxblood
Oxeyed
Oxidative
Oxidized
Oxonian
Oxyacetic
Oxygenic
Oxyntic
Oxytocic
Oyster
Oysterish
Oysterless
Oysterlike
Oystery
Ozone-friendly

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933 Adjectives That Start With O with Interesting Examples - English Study Online (2024)