adj. 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"

adj. having a strong physiological or chemical effect; "a potent toxin"; "potent liquor"; "a potent cup of tea", "a stiff drink"

adj. producing a strong effect; "gave an impressive performance as Othello"; "a telling gesture"

adj. characterized by or full of force and vigor; "a hard-hitting expose"; "a trenchant argument"

adj. exerting or capable of exerting strong physiological or chemical effects"a potent toxin"; "potent liquor"

adj. productive of profit; "a profitable enterprise"; "a fruitful meeting"

adj. sufficiently valuable to justify the investment of time or interest; "a worthwhile book"

adj. 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 toward peace"; "made an effective entrance"; "his complaint proved to be effectual in bringing action"; "an efficacious law"

adj. lacking the power to produce a desired effect; "laws that are inefficacious in stopping crime"