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  1. Dictionary
    inefficacious
    /ˌɪnɛfɪˈkeɪʃəs/

    adjective

    • 1. not producing the desired effect: "social conventions honed over thousands of years were suddenly inefficacious"

    More definitions, origin and scrabble points

  2. : lacking the power to produce a desired effect : ineffective. inefficaciously adverb. inefficaciousness noun. Synonyms. counterproductive. feckless. hamstrung. ineffective. ineffectual. inefficient. inexpedient. See all Synonyms & Antonyms in Thesaurus. Examples of inefficacious in a Sentence.

  3. Definitions of. inefficacious. adjective. lacking the power to produce a desired effect. “laws that are inefficacious in stopping crime”. synonyms: ineffective, ineffectual, uneffective. not producing an intended effect. see more.

  4. Inefficacious definition: not able to produce the desired effect; ineffective.. See examples of INEFFICACIOUS used in a sentence.

  5. adverb. inefficacy (ɪnˈɛfɪkəsɪ ), inefficaciousness (ˌineffiˈcaciousness) or inefficacity (ˌɪnɛfɪˈkæsɪtɪ ) noun. Word Frequency. inefficacious in American English. (ˌɪnɛfɪˈkeɪʃəs ) adjective. not efficacious; unable to produce the desired effect. an inefficacious medicine. Webster’s New World College Dictionary, 4th Edition.

  6. Synonyms for INEFFICACIOUS: unsuccessful, inefficient, ineffective, counterproductive, inexpedient, ineffectual, worthless, useless; Antonyms of INEFFICACIOUS: effective, efficacious, efficient, effectual, expedient, operant, successful, beneficial.

  7. Define inefficacious. inefficacious synonyms, inefficacious pronunciation, inefficacious translation, English dictionary definition of inefficacious. adj. Not capable of producing a desired effect or result; ineffective. in·ef′fi·ca′cious·ly adv. American Heritage® Dictionary of the English Language,...

  8. : lack of power to produce a desired effect. Examples of inefficacy in a Sentence. Recent Examples on the Web Frustrated by conventional treatments’ inefficacy, Christina discovered Gronich’s clinic and benefited from her comprehensive, whole-body approach to skincare.