Main entry: powerful
Definition: having great power or force or potency or effect
Usage: the most powerful government in western Europe; his powerful arms; a powerful bomb; the horse's powerful kick; powerful drugs; a powerful argument
Antonyms: powerless
Definition: lacking power
Antonyms: weak
Definition: wanting in physical strength
Antonyms: impotent
Definition: lacking power or ability
Antonyms: impotent
Definition: (of a male) unable to copulate
Main entry: brawny, powerful, muscular, sinewy, hefty
Definition: (of a person) possessing physical strength and weight; rugged and powerful
Usage: a hefty athlete; a muscular boxer; powerful arms
Antonyms: weak
Definition: wanting in physical strength
Main entry: knock-down, powerful
Definition: strong enough to knock down or overwhelm
Usage: a knock-down blow
Antonyms: weak
Definition: wanting in physical strength
Main entry: herculean, powerful
Definition: displaying superhuman strength or power
Usage: herculean exertions
Antonyms: subhuman
Definition: less than human or not worthy of a human being
Main entry: powerful, potent
Definition: having great influence
Antonyms: uninfluential
Definition: not influential