1. Antonyms: (adj) yielding, flexible, pliable
1. Adamant (adj.): firm in purpose or opinion, unyielding, obdurate, implacable, inflexible;(n) an extremely hard substance
Antonyms: (adj) yielding, flexible, pliable

2. Synonyms: furor, hullabaloo, tumult, pandemonium
2. Brouhaha (n): a confused hodgepodge of sounds, hubbub; an uproar or commotion that goes far beyond what is justified
Synonyms: furor, hullabaloo, tumult, pandemonium

3. Synonyms: (n) stronghold, citadel, bastion, rampart
3. Bulwark (n): a strong defense or protection, a solid wall-like structure for defense; (v) to provide such defense or protection
Synonyms: (n) stronghold, citadel, bastion, rampart
Antonyms: (n) breach, weak point in the defense

4. 4. Choleric (adj.): easily made angry, bad- tempered
Synonyms: irascible, testy, splenetic, bilious
Antonyms: affable, genial, even-tempered

5. Antonyms: stimulate, whet
5. Cloy (v): to spoil or destroy an appetite by too much indulgence, especially in sweet or rich things; to glut, satiate, surfeit
Antonyms: stimulate, whet

6. 6. curtail (v): to cut short, bring to a halt or end sooner than expected; to reduce
Synonyms: limit, abbreviate, abridge, contract
Antonyms: protract, extend

7. Synonyms: respect, consideration, courtesy
7. Deference (n): courteous yielding to the wishes and ideas of another person; great respect marked by submission, as to a superior
Synonyms: respect, consideration, courtesy
Antonyms: contempt, disrespect, scorn, disdain

8. 8. Definitive (adj.): conclusive, final, representing the limit of what can be done
Synonyms: exhaustive, authoritative
Antonyms: tentative, inconclusive

9. Synonyms: conduct, behavior, bearing, carriage
9. Demeanor (n): the way a person behaves, overall impression made by comportment, manner, etc.; facial appearance, mien
Synonyms: conduct, behavior, bearing, carriage

10. 10. Enigmatic (adj.): puzzling, perplexing, inexplicable, not easily understood
Synonyms: baffling, mysterious, inexplicable
Antonyms: intelligible, understandable, fathomable

11. Synonyms: (adj.) spontaneous, improvised, unrehearsed
11. Impromptu (adj. adv.): without preparation, offhand, suddenly or hastily done; (n) an extemporaneous composition or remark; a minimal piece suggestive of improvisation
Synonyms: (adj.) spontaneous, improvised, unrehearsed
Antonyms: (adj.) rehearsed, planned, prepared, premeditated

12. 12. Mawkish (adj.) excessively and objectionable sentimental; having a mildly sickening flavor
Synonyms: sentimentalized, maudlin, mushy, nauseating
Antonyms: unsentimental, callous, insensitive

13. Antonyms: enrage, anger, aggravate, exacerbate
13. Mollify (v): to soften, make gentle, pacify; to clam, allay ( as an emotion), assuage, appease, placate; to reduce in intensity
Antonyms: enrage, anger, aggravate, exacerbate

14. Synonyms: burden, obligation, duty, stigma
14. Onus (n): something that is heavy or burdensome( especially an unwelcome responsibility); a stigma; blame
Synonyms: burden, obligation, duty, stigma

15. 15. Presentiment (N): a vague sense of approaching misfortune
Synonyms: foreboding, premonition, hunch

16. Synonyms: (adj.) prodigal, improvident;(n) spendthrift
16. Profligate (adj.): given over to dissipation and self-indulgence, immoral; recklessly extravagant;(n) a person given to self-indulgent and wild spending
Synonyms: (adj.) prodigal, improvident;(n) spendthrift
Antonyms: (adj.) penny-pinching, frugal, economical

17. Synonyms: pay, absolve, subside, abate
17. Remit (v): to send or hand in (as money); to cancel (as a penalty or punishment), forgive, pardon; to lessen, diminish; to put off, postpone, defer
Synonyms: pay, absolve, subside, abate

18. 18. Requisite (adj.); needed, necessary, regarded as essential or indispensable
Synonyms: required, obligatory, incumbent
Antonyms: nonessential, superfluous, optional

19. Don’t have any synonym and antonym
19. Sartorial (adj.): of or pertaining to a tailor or his work; having to do with clothes or dress (especially men’s)
Don’t have any synonym and antonym

20. 20. Thwart (v): to oppose successfully; to prevent, frustrate
Synonyms: foil, baffle
Antonyms: aid, assist, abet, further