Synonyms for unsuccessful

defeated, disappointed, frustrated, nonsuited, abortive, aborted, disastrous, unprosperous, unproductive, unfortunate, unlucky, futile, vain, in vain, failing, failed, fruitless, worthless, sterile, bootless, unavailing, ineffectual, ineffective, inefficacious, immature, manqué (French), useless, foiled, shipwrecked, overwhelmed, overpowered, broken, overborne, ruined, destroyed, thwarted, crossed, disconcerted, dashed, circumvented, premature, inoperative, of no effect, balked, duped, left holding the sack*, skunked*, stymied*, jinxed*, out of luck*, stuck*.

Antonyms successful*, fortunate, lucky.