Synonyms|165Antonyms|58|Broader|3Narrower|3Related|220
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dead failure(expression, idiom, failure)
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defenselessness(noun, weakness, hopelessness, helplessness, subjection)
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disaster(noun, defeat, blow, failure, mistake)
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dissatisfaction
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disutility
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downer(noun, defeat, blow, failure, mistake)
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downfall(noun, defeat, blow, failure, mistake)
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drag(noun, defeat, blow, failure, mistake)
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dud(noun, defeat, blow, failure, mistake)
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efforts
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errand
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error(noun, defeat, blow, failure, mistake)
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false alarm(noun, expression, defeat, blow, failure)
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farce
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faux pas(noun, expression, defeat, blow, failure)
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fiasco(noun, defeat, blow, failure, mistake)
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fizzle(noun, defeat, blow, failure, mistake)
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flash in the pan(noun, expression, idiom, defeat, blow)
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impasse(noun, defeat, blow, failure, mistake)
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impotent
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ChicagoSmart Define. 2015. "inefficacy thesaurus" https://smartdefine.org/inefficacy/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, inefficacy thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/inefficacy/thesaurus/synonyms>.
MLASmart Define. "inefficacy thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/inefficacy/thesaurus/synonyms>