General Antonyms:
* Dishonest: This is a strong antonym, implying deception or untruthfulness.
* Insincere: This suggests a lack of genuine feeling or honesty.
* Deceptive: This implies an intention to mislead or misrepresent.
More Specific Antonyms:
* Reserved: This implies holding back thoughts or opinions.
* Cautious: This suggests being careful about what is said or revealed.
* Diplomatic: This implies being tactful and avoiding bluntness.
* Evasive: This suggests avoiding a direct answer or trying to avoid the topic.
* Concealing: This implies hiding or keeping something secret.
* Close-mouthed: This suggests being unwilling to talk or share information.
The best antonym for "candid" will depend on the specific context.