Inefficacy

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    The condition of being ineffective uncountable, usually
  2. 2
    a lack of efficacy wordnet

Synonyms

All synonyms
absurdityemptinessfailurefatuityfutilityimpotence

Etymology

From in- + efficacy.

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