146 entries under adjective topic. ×

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lacking
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literary sleeveless
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meaningless(invalid, unsubstantiated, unsupported, annulled)
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not serious(expression, empty, worthless, frivolous)
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not well(expression, weak, short, weakening)
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nullified(meaningless, invalid, unsubstantiated, unsupported)
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of no avail(expression, idiom, empty, worthless)
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purposeless
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rambling(empty, worthless, frivolous, ineffective)
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scant(weak, short, inadequate, useless)
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scanty(weak, short, weakening, worsening)
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scarce(weak, short, weakening, worsening)
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short(weak, weakening, worsening, deteriorating)
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superficial(empty, worthless, frivolous, ineffective)
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terrible(unfortunate, grievous)
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to no avail
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unhelpful(empty, worthless, frivolous, ineffective)
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unnecessary(empty, worthless, frivolous, ineffective)
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unpractical
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unserviceable
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APASmart Define. (2016). unsuccessful thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/unsuccessful/thesaurus/synonyms
ChicagoSmart Define. 2016. "unsuccessful thesaurus" https://smartdefine.org/unsuccessful/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, unsuccessful thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/unsuccessful/thesaurus/synonyms>.
MLASmart Define. "unsuccessful thesaurus" 24 March 2016. Web. 29 September 2026. <https://smartdefine.org/unsuccessful/thesaurus/synonyms>