EFFICACIOUS

efficacious

1. [Adjective]: marked by qualities giving the power to produce an intended effect; "written propaganda is less efficacious than the habits and prejudices...of the readers"-Aldous Huxley; "the medicine is efficacious in stopping a cough"

2. [Adjective]: producing or capable of producing an intended result or having a striking effect; "an air-cooled motor was more effective than a witch''s broomstick for rapid long-distance transportation"-LewisMumford; "effective teaching methods"; "effective steps towar

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