The antonym of CANDID is:
AGuileless
BImpartial
CIngenuous
DDeceitful
Answer & Solution
Correct answer: D. Deceitful
1. Candid means open and straightforward.
2. Guileless, impartial and ingenuous agree with it.
3. Its opposite is deceitful.
_Source: Ordway, Synonyms and Antonyms (Project Gutenberg)_