Inefficacious

adj

adj ·Uncommon ·Advanced level

Definitions

Adjective
  1. 1
    Incapable of having the intended consequence.
  2. 2
    Not effective.
Adjective
  1. 1
    lacking the power to produce a desired effect wordnet

Synonyms

All synonyms
abortivebarrenbootlesscounterproductiveeffeteempty

Etymology

From in- + efficacious.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.