3
undone
3
unrewarding(adjective, arouse bad feelings)
2
bad(adjective, unhappy, inappropriate, adverse, damaging)
2
balked
2
beaten
2
dead(adjective, meaningless, invalid, unsubstantiated, unsupported)
2
doomed(adjective, bad, poor, miserable, failing)
2
dreadful(adjective, unfortunate, grievous)
2
fail(verb, failure)
2
inefficient(adjective, weak, inferior, inadequate, limited)
2
infelicitous(adjective, bad, poor, awkward, inappropriate)
2
inoperative(adjective, inferior, inadequate, limited, feeble)
2
insignificant(adjective, empty, worthless, hopeless, frivolous)
2
lame(weak, inferior, inadequate, limited, feeble)
2
losing(adjective, failing, vain, ineffective)
2
manque
2
nugatory(adjective, inferior, inadequate, limited, feeble)
2
ruined(bad, poor, awkward, inappropriate, unfortunate)
2
unfavorable(adjective, bad, poor, miserable, wretched)
2
unpersuasive
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APASmart Define. (2016). unsuccessful thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/unsuccessful/thesaurus/synonyms
ChicagoSmart Define. 2016. "unsuccessful thesaurus" https://smartdefine.org/unsuccessful/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, unsuccessful thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/unsuccessful/thesaurus/synonyms>.
MLASmart Define. "unsuccessful thesaurus" 24 March 2016. Web. 27 September 2026. <https://smartdefine.org/unsuccessful/thesaurus/synonyms>