Open English Wordnet
Adjectives
(a)effective, effectual, efficaciousproducing 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”