English Vocabulary - Words Start from Letter 'O'

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English Vocabulary
Words Start from Letter 'O'

1. OBDURATE: Hard-hearted; stubborn
   Sentence:
   * An obdurate, unrepentant criminal.
   Synonyms: Adamant, Unyielding, Inflexible.
   Antonyms: Submissive, Docile, Compliant.
   
   
2. OBLIVIOUS (noun: OBLIVION): Forgetful; absent-minded.
   Sentence:
   * Walking oblivious of his surroundings.
   Synonyms: Unmindful, Heedless, Abstracted.
   
   
3. OBSESSION: A persistent feeling, idea, activity, etc., which dominates a person; the state of being exclusively preoccupied by a fixed idea.
   Sentence:
   * Now that he has learned bowling, it has become his obsession.
   Synonyms: Mania, Infatuation (a foolish passion), monomania.
   
   
4. OBSOLETE: No longer in use.
   Sentence:
   * An obsolete word, not even included by most dictionaries.
   Synonyms: Archaic, Antiquated
   
   
5. OBTRUSIVE (verb: OBTRUDE): Thrusting oneself or itself into undue prominence.
   Sentence:
   * Made himself obnoxiously obtrusive.
   Synonyms: Intrusive, Aggressive
   
   
6. OBVIATE: To prevent, dispose of, or make unnecessary by appropriate actions.
   Sentence:
   * An act which obviated all objections.
   Synonyms: Preclude, Forestall.
   
   
7. OMNIPOTENT: All-powerful
   Sentence:
   * An omnipotent despot.
   
   
8. ONUS: Burden; duty; obligation.
   Sentence:
   * Bore the onus of his difficult office creditably.
   
   
9. OSTENSIBLE: Apparent; pretended.
   Sentence:
   * His ostensible, though not actual, purpose.
   Synonyms: Professed, Plausible (that is, appearing true, reasonable, or fair), Specious.
   
   
10. OSTRACIZE: To banish; to exclude from public favor or privileges.
    Sentence:
    * A former premier ostracized by popular vote.
    Synonym: Outlaw