Synonyms|215Antonyms|56|Broader|0Narrower|0Related|93
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improvident(incompetent, wasteful, unproductive)
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inefficiencies
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inexpedient
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inexpert(incompetent, wasteful, unproductive)
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inservient
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insubstantial
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invertebrate(adjective, ineffectual)
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lamer
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no way(expression, inadequate, feeble, useless, unpolluted)
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non-functioning
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not effective(expression, inadequate, feeble, useless, unpolluted)
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nul
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nullify
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of no avail(expression, idiom, inutility)
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of no moment
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otiose
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overridden
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poorness
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prodigal(incompetent, wasteful, unproductive)
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puny
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APASmart Define. (2016). inefficacious thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/inefficacious/thesaurus/synonyms
ChicagoSmart Define. 2016. "inefficacious thesaurus" https://smartdefine.org/inefficacious/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, inefficacious thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/inefficacious/thesaurus/synonyms>.
MLASmart Define. "inefficacious thesaurus" 24 March 2016. Web. 24 September 2026. <https://smartdefine.org/inefficacious/thesaurus/synonyms>