1. PERFIDIOUS (ADJECTIVE): betraying
Synonyms: deceitful, deceptive
Antonyms: honest, forthright
Example Sentence: His perfidious nature led him nowhere.
2. OBNOXIOUS (ADJECTIVE): repulsive
Synonyms: disgusting, hateful
Antonyms: agreeable, decent
Example Sentence: His obnoxious habits are enhancing day by day.
3. PERNICIOUS (ADJECTIVE): destructive
Synonyms: injurious, unsafe
Antonyms: safe, harmless
Example Sentence: Little kid’s pernicious mind had proved fatal to his family.
4. HUMONGOUS (NOUN): very large
Synonyms: immense, gigantic
Antonyms: small, tiny
Example Sentence: I saw a humongous palace nearby Delhi.
5. WINSOME (ADJECTIVE): attractive
Synonyms: captivating, delightful
Antonyms: repulsive, unattractive
Example Sentence: Butterfly has winsome wings.
6. IRREVOCABLE (ADJECTIVE): fixed
Synonyms: immutable, irreversible
Antonyms: alterable, revocable
Example Sentence: My plan of going to the US is irrevocable.
7. WILT (VERB): fail
Synonyms: dwindle, fade
Antonyms: develop, expand
Example Sentence: He was wilted at race.
8. JUBILATION (NOUN): rejoicing
Synonyms: happiness, joy
Antonyms: sadness, sorrow
Example Sentence: When he was engaged in jubilation all his empire was set ablazed.
9. ANIMUS (NOUN): hostility
Synonyms: bile, mind
Antonyms: friendliness, kindness
Example Sentence: Animus attitude will not work here.
10. IMPETUOUS (ADJECTIVE): acting without thinking
Synonyms: ardent, impulsive
Antonyms: calm, sensible
Example Sentence: He is an impetuous creature.