Antonyms: Words Starting with O

Antonyms are words with opposite meanings. Below is a list of important words starting with O along with their meanings and example sentences.

Word Definition, Antonyms, and Example Sentences

1. Obstruct (Verb) 🔊
  1. Meaning: To block or hinder something.
  2. Antonyms: Aid, Help, Support, Clear
  3. Use in Sentence:
    • The fallen tree obstructed the road.
    • Workers cleared the path.
2. Obliging (Adjective) 🔊
  1. Meaning: Willing to help or please.
  2. Antonyms: Unhelpful, Selfish, Difficult, Rude
  3. Use in Sentence:
    • He was always obliging.
    • The clerk was rude.
3. Obscure (Adjective/Verb) 🔊
  1. Meaning: Not clear or hard to understand.
  2. Antonyms: Clear, Obvious, Known, Visible
  3. Use in Sentence:
    • The meaning of the text was obscure.
    • The instructions were clear.
4. Obstinate (Adjective) 🔊
  1. Meaning: Stubborn and unwilling to change.
  2. Antonyms: Flexible, Compliant, Yielding, Cooperative
  3. Use in Sentence:
    • He was obstinate about his decision.
    • She was flexible in her approach.
5. Obtain (Verb) 🔊
  1. Meaning: To get or acquire something.
  2. Antonyms: Lose, Surrender, Forfeit, Miss
  3. Use in Sentence:
    • He obtained a new passport.
    • She lost her documents.
6. Obvious (Adjective) 🔊
  1. Meaning: Easily seen or understood.
  2. Antonyms: Hidden, Unclear, Subtle, Ambiguous
  3. Use in Sentence:
    • The answer was obvious.
    • The clue was hidden.
7. Odious (Adjective) 🔊
  1. Meaning: Extremely unpleasant or repulsive.
  2. Antonyms: Pleasant, Agreeable, Attractive, Delightful
  3. Use in Sentence:
    • His behavior was odious.
    • The smell was pleasant.
8. Offensive (Adjective) 🔊
  1. Meaning: Causing anger or hurt.
  2. Antonyms: Polite, Respectful, Pleasant, Friendly
  3. Use in Sentence:
    • His joke was offensive.
    • She made a polite comment.
9. Occult (Adjective/Noun) 🔊
  1. Meaning: Hidden or mysterious; related to supernatural powers.
  2. Antonyms: Known, Clear, Obvious, Natural
  3. Use in Sentence:
    • He studied occult practices.
    • The rules were clear.
10. Offspring (Noun) 🔊
  1. Meaning: Children or young of a person, animal, or plant.
  2. Antonyms: Parent, Ancestor, Forebear, Progenitor
  3. Use in Sentence:
    • The dog had five offspring.
    • Their ancestors lived in the village.
11. Ominous (Adjective) 🔊
  1. Meaning: Giving a worrying or threatening impression.
  2. Antonyms: Promising, Auspicious, Favorable, Bright
  3. Use in Sentence:
    • The clouds looked ominous.
    • The sky was bright and clear.
12. Opaque (Adjective) 🔊
  1. Meaning: Not transparent; difficult to understand.
  2. Antonyms: Transparent, Clear, Obvious, Lucid
  3. Use in Sentence:
    • The glass was opaque.
    • The water was transparent.
13. Optimist (Noun) 🔊
  1. Meaning: Someone who expects good outcomes.
  2. Antonyms: Pessimist, Cynic, Doubter, Skeptic
  3. Use in Sentence:
    • She is an optimist.
    • He is a pessimist.
14. Oracular (Adjective) 🔊
  1. Meaning: Wise or prophetic.
  2. Antonyms: Unwise, Foolish, Ignorant, Uninformed
  3. Use in Sentence:
    • The elder gave oracular advice.
    • The young man gave foolish advice.
15. Ordain (Verb) 🔊
  1. Meaning: To officially order or establish.
  2. Antonyms: Cancel, Revoke, Nullify, Abolish
  3. Use in Sentence:
    • The king ordained the law.
    • They canceled the rule.
16. Ornamental (Adjective) 🔊
  1. Meaning: Decorative; not functional.
  2. Antonyms: Functional, Practical, Useful, Effective
  3. Use in Sentence:
    • The vase was ornamental.
    • The tool was practical.
17. Outbreak (Noun) 🔊
  1. Meaning: A sudden occurrence, usually of disease or conflict.
  2. Antonyms: Calm, Peace, Stability, Quiescence
  3. Use in Sentence:
    • There was an outbreak of flu.
    • The town enjoyed peace.
18. Outrage (Noun/Verb) 🔊
  1. Meaning: Extreme anger or offense.
  2. Antonyms: Approval, Calm, Happiness, Satisfaction
  3. Use in Sentence:
    • The decision caused public outrage.
    • The news was met with approval.

List of Words with Antonyms

# Word Antonyms
1ObstructAid, Help, Support, Clear
2ObligingUnhelpful, Selfish, Difficult, Rude
3ObscureClear, Obvious, Known, Visible
4ObstinateFlexible, Compliant, Yielding, Cooperative
5ObtainLose, Surrender, Forfeit, Miss
6ObviousHidden, Unclear, Subtle, Ambiguous
7OdiousPleasant, Agreeable, Attractive, Delightful
8OffensivePolite, Respectful, Pleasant, Friendly
9OccultKnown, Clear, Obvious, Natural
10OffspringParent, Ancestor, Forebear, Progenitor
11OminousPromising, Auspicious, Favorable, Bright
12OpaqueTransparent, Clear, Obvious, Lucid
13OptimistPessimist, Cynic, Doubter, Skeptic
14OracularUnwise, Foolish, Ignorant, Uninformed
15OrdainCancel, Revoke, Nullify, Abolish
16OrnamentalFunctional, Practical, Useful, Effective
17OutbreakCalm, Peace, Stability, Quiescence
18OutrageApproval, Calm, Happiness, Satisfaction