| a. | 1. | Not successful; not producing the desired event; not fortunate; meeting with, or resulting in, failure; unlucky; unhappy. |
| Adj. | 1. | unsuccessful - not successful; having failed or having an unfavorable outcome Antonyms: successful - having succeeded or being marked by a favorable outcome; "a successful architect"; "a successful business venture" |
| 2. | unsuccessful - failing to accomplish an intended result; "an abortive revolt"; "a stillborn plot to assassinate the President" |