Efficacious Moderate

marked by qualities giving the power to produce an intended effect

"written propaganda is less efficacious than the habits and prejudices...of the readers"

"the medicine is efficacious in stopping a cough"

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"

"effective teaching methods"

"effective steps toward peace"

"made an effective entrance"

"his complaint proved to be effectual in bringing action"

"an efficacious law"

Effective; possessing efficacy.