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

Antonyms

All antonyms

effectivenessefficacyhelpfulnesslarvacide

Etymology

From in- + efficacy.