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Definition of unsuccessful : Not successful; not producing the desired event; not fortunate; meeting with, or resulting in, failure; unlucky; unhappy.

Synonyms:

empty-handed, ruined, disappointed, unrealized, done for, losing, unprofitable, self-defeating, defeated, winless, barren, hitless, used, attempted, unrewarded, unfruitful, failing, washed-up, out, sunk, goalless, undone, no-win, thrive, down-and-out, discomfited, unfulfilled, unplaced, stillborn, scoreless, unrealised

inoperative, balked, nonsuited, disconcerted, duped, unfortunate, skunked, overwhelmed, unlucky, aborted, worthless, broken, disastrous, unavailing, crossed, unproductive, dashed, of no effect, stuck, bootless, out of luck, circumvented, shipwrecked, immature, unprosperous, inefficacious, jinxed, in vain, stymied, ineffective, premature, destroyed, overborne, sterile, overpowered, left holding the sack

fruitless, failed, useless, futile, thwarted, ineffectual, foiled, pointless, frustrated, abortive, vain

Usage examples:

• Unlike the unsuccessful attempt of Abraham Thompson and June Scott in forming the Union Society, the Asbury Church became permanently established. - "The History of the Negro Church", Carter Godwin Woodson.
• But the porter had to return unsuccessful, with the answer that he could not come; and to the question, " Why?" - "Best Russian Short Stories", Various.
• And she- she was the most uninteresting, unsuccessful female person I ever did know. - "Then I'll Come Back to You", Larry Evans.