say it: uhn-suhk-SEH-sfuhl
unsuccessful is an adjective meaning "not successful; having failed or having an unfavorable outcome". It carries 2 recorded senses.
not successful; having failed or having an unfavorable outcome
failing to accomplish an intended result
“an abortive revolt”
“a stillborn plot to assassinate the President”
Definitions, synonyms and semantic relations for unsuccessful come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.