Synonyms|454Antonyms|159|Broader|6Narrower|1Related|1k

45 entries under ineffectual topic. ×

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implausible(adjective, poor, inadequate, ineffective)
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improbable(adjective, poor, inadequate, ineffective)
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incomplete(adjective, poor, inadequate, ineffective)
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inconceivable(adjective, poor, inadequate, ineffective)
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inconclusive(adjective, poor, inadequate, ineffective)
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incredible(adjective, poor, inadequate, ineffective)
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invalid(adjective, poor, inadequate, ineffective)
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lacking(adjective, poor, inadequate, ineffective)
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palsied(adjective, soft, uncertain, nervous, unstable)
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poor(adjective, inadequate, ineffective, toothless)
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raw(adjective, poor, inadequate, ineffective)
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shallow(adjective, poor, inadequate, ineffective)
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slight(adjective, poor, inadequate, ineffective)
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slim(adjective, poor, inadequate, ineffective)
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small(adjective, poor, inadequate, ineffective)
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substandard(adjective, poor, inadequate, ineffective)
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thick(adjective, poor, inadequate, ineffective)
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thin(adjective, weak, poor, inadequate, feeble)
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toothless(adjective, poor, inadequate, ineffective)
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unbelievable(adjective, poor, inadequate, ineffective)
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ChicagoSmart Define. 2015. "spineless thesaurus" https://smartdefine.org/spineless/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, spineless thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/spineless/thesaurus/synonyms>.
MLASmart Define. "spineless thesaurus" 13 April 2015. Web. 26 September 2026. <https://smartdefine.org/spineless/thesaurus/synonyms>