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Crossword clue: lacking the power to produce a desired effect

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

Possible answers

inefficacious 13 letters wn-def

lacking the power to produce a desired effect

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Similar clues

capacity or power to produce a desired effect 67% similar → efficaciousness, efficacy

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