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Crossword clue: a lack of efficacy

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

inefficaciousness 17 letters wn-def

a lack of efficacy

inefficacy 10 letters wn-def

a lack of efficacy

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Related clues

Want of effect, or of power to produce the effect; inefficacy.Another word for inefficaciousness