unsuccessful
1. [ adjective ] not successful; having failed or having an unfavorable outcome
Related terms: successful defeated winless scoreless attempted hitless self-defeating unplaced failed empty-handed unfulfilled losing no-win out done_for unfulfilled down-and-out empty-handed down-and-out unfortunate defeated unprofitable success
2. [ adjective ] failing to accomplish an intended result
Synonyms: stillborn abortive
Examples:

"an abortive revolt" "a stillborn plot to assassinate the President"

Related terms: unfruitful
Similar spelling:   unsuccessfully
  unaccessible
  unjustness