SET 4: Important words, their meanings and antonyms for CAT

Vocabulary is one of the most important cogs in the large wheel of English language”.
A good grasp on vocabulary is essential for high scores in CAT examination. The different sections of CAT verbal are quite impossible to crack without the sound knowledge of vocabulary. Be it reading comprehension or sentence correction, the candidate is going face difficulty in solving the questions without having a good grip on difficult words. So here are some words which will help you build your vocabulary. Please try to find synonyms for these:
EXTINCT: No longer existing or active
Antonym: extant
DOLOROUS: Sorrowful; mournful
Antonyms: jocund, blithe, mirthful
ALACRITY: Eagerness; cheerful promptness
Antonyms: apathy, nonchalance, sluggishness, lethargy, phlegmatism
DISCONSOLATE: Depressed; without hope or possibility of consolation
Antonyms: blithesome, carefree
ALLUDE: To refer to indirectly
Antonyms: refer, cite
CREDULOUS: Inclined to believe anything; easily imposed upon
Antonyms: incredulous, skeptical
DEVOUT: Devoted to religious observances
Antonym: impious
AFFABLE: Sociable, courteous, and agreeable in manner a much admired
Antonyms: curt, brusque, rude, boorish, surly
IMPECCABLE: Faultless
Antonyms: culpable, fallible
TEMERITY: Unwise or reckless boldness
Antonyms: prudence, circumspection, wariness