S: (adj) potent, strong (having or wielding force or authority) "providing the ground soldier with increasingly potent weapons"
S: (adj) potent, strong, stiff (having a strong physiological or chemical effect) "a potent toxin"; "potent liquor"; "a potent cup of tea"; "a stiff drink"
S: (adj) effective, effectual, efficacious (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"
S: (adj) powerful (having great power or force or potency or effect) "the most powerful government in western Europe"; "his powerful arms"; "a powerful bomb"; "the horse's powerful kick"; "powerful drugs"; "a powerful argument"