Important Antonyms Starting with O

Obey → Disobey / Defy

Occupy → Vacate / Leave

Old → Young / New

Optimist → Pessimist

Ordinary → Extraordinary / Special

Open → Close / Shut

Opponent → Supporter / Ally

Order → Disorder / Chaos

Outward → Inward

Outside → Inside

Over → Under

Overcome → Succumb / Yield

Offer → Refuse / Deny

On → Off

Obvious → Obscure / Hidden

Opaque → Transparent / Clear

Offence → Defence / Innocence

Important Antonyms Starting with O

Official → Unofficial / Informal

Opportunity → Misfortune / Loss

Optimistic → Pessimistic

Obedient → Disobedient / Defiant

Occupied → Vacant / Empty

Offensive → Defensive / Polite

Outgoing → Shy / Introverted

Oblige → Displease / Offend

Odd → Even / Normal

Overestimate → Underestimate

Opposition → Support / Agreement

Owner → Tenant / Renter

Outstanding → Ordinary / Average

Outdated → Modern / Current

Obscure → Clear / Obvious

Over → Beneath / Below

Openly → Secretly / Clandestinely

Outwardly → Inwardly / Secretly

Oppose → Support / Approve

Outflow → Inflow

Overload → Unload / Lighten

Overwork → Relax / Rest

Offensive language → Polite language

Optimism → Pessimism

Important Antonyms Starting with O

Outlive → Die / Perish

Outer → Inner / Interior

Objection → Approval / Agreement

Overthrow → Uphold / Support

Outcry → Silence / Acceptance

Outskirts → Center / Middle

Overflow → Drain / Empty

Obstacle → Assistance / Help

Obligation → Freedom / Choice

Outspoken → Reserved / Silent

Outburst → Calmness / Peace

Overpower → Weaken / Yield

Offensive act → Defensive act

Off → On

Ordinary life → Extraordinary life

Outperform → Underperform

Outbreak → End / Suppression

Outer space → Inner world / Earth

Offensive smell → Pleasant smell

Overconfident → Diffident / Timid

Open-minded → Narrow-minded / Prejudiced

Obesity → Slimness / Leanness

Outgrow → Shrink / Diminish

Outgoing nature → Reserved nature

Original → Copy / Fake

Outlaw → Citizen / Legal person

Overflowing → Empty / Lacking

Outright → Partial / Indirect

Out of date → Up-to-date / Current

Important Antonyms Starting with O

Overjoyed → Depressed / Sad

Outshine → Fade / Lose

Offensive remark → Compliment / Praise

Obstruction → Aid / Assistance

Overhead → Underground / Beneath

Open secret → Hidden fact

Outward journey → Return journey

Onstage → Offstage

Oppressive → Liberal / Kind

Oversee → Ignore / Overlook

Overindulge → Control / Resist

Outmoded → Fashionable / Modern

Occupation → Unemployment / Idleness

Outperformer → Underachiever

Opposition leader → Ruling leader

Obvious truth → Hidden truth

Outer cover → Inner core

Outcry of anger → Calm acceptance

Outstretch → Shrink / Contract

Overflowed → Dried / Empty

Outlawed → Legalized / Allowed

Obliging → Rude / Unhelpful

Important Antonyms Starting with O

Open truth → Hidden lie

Out of order → In order / Functional

Overweight → Underweight / Thin

Offence taken → Forgiveness given

Outwit → Be fooled / Fail

Offensive attack → Defensive retreat

Outside world → Inside world / Domestic

Outstanding result → Poor result / Average

Important Antonyms Starting with P