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Adjective: unsuccessful  ,ún-suk'ses-ful
  1. Failing to accomplish an intended result
    "an unsuccessful revolt";
    - abortive, stillborn
  2. Not successful; having failed or having an unfavourable outcome

See also: attempted, defeated, disappointed, discomfited, done for, down-and-out, empty-handed, foiled, frustrated, goalless, hitless, no-win, out, pointless, scoreless, self-defeating, success, sunk, thwarted, undone, unfortunate, unfruitful, unfulfilled, unplaced, unprofitable, unrealised [Brit], unrealized, unrewarded, washed-up, winless

Antonym: successful