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unsuccessful (adj.)

1610s, from un- (1) "not" + successful (adj.). Related: Unsuccessfully. A noun unsuccess "lack of success" is recorded from 1580s.

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Definitions of unsuccessful from WordNet

unsuccessful (adj.)
not successful; having failed or having an unfavorable outcome;
unsuccessful (adj.)
failing to accomplish an intended result;
Synonyms: abortive / stillborn
From wordnet.princeton.edu