Terse is brief, lecherous is someone extremely interested in sex and Indecent means impure .

Correct Option: B

Lachrymose is tearful, mournful will also be tearful, terse is brief, lecherous is someone extremely interested in sex.

Prude is a person who has an exxagerated sense of propriety and gets shocked easily. Timid is a person who is shy, fearful.

Correct Option: C

Punctilious means very careful about details, meticulous also means the same, prude is a person who has an exxagerated sense of propriety and gets shocked easily. Timid is a person who is shy, fearful.

Probe is to question , Prove means demonstrate and search means try to find something by looking .

Correct Option: C

Proboscis means long flexible snout, probe is to question.

Vain means false pride, polished is sophisticated and refined so opposite to Gauche .

Correct Option: D

Gauche is lacking ease or grace of manner, i.e. someone dull and incipient, Vain means false pride, polished is sophisticated and refined so opposite to Gauche, tactless is someone who is dumb or dull.

Obstinate mean stubborn, Secondary means subsidiary and Competitive means as good as .

Correct Option: C

Loquacious is to talk a lot, i.e.., talkative, obstinate mean stubborn,