- unsuccessful - not successful; having failed or having an unfavorable outcome
Antonyms: successful, booming, flourishing, palmy, prospering, prosperous, roaring, thriving, eminent, in, made, no-hit, productive, self-made, sure-fire, victorious, winning, triple-crown
- abortive, stillborn, unsuccessful - failing to accomplish an intended result; "an abortive revolt"; "a stillborn plot to assassinate the President"
Antonym: fruitful (indirect, via unfruitful)