Synonyms for affirmative

agreeing, affirming, affirmatory, positive, consenting, concurring, approving, ratifying, assenting, supporting, complying, endorsing, acknowledging, acquiescent, establishing, corroborative, confirmatory, confirming.

Antonyms negative*, contradictory, noncommittal.

favorably, in assent, in agreement, with an affirmative answer; see yes.