933 Adjectives That Start With O with Interesting Examples

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.

According to Wikipedia, an adjective is a word that describes a noun. An adjective is a word that gives more information about the noun that goes with it. For examples:

The sky is blue.
The joke David told was so funny, I could not stop laughing all day.

Table of Contents

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.

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.