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WordNet (r) 3.0 (2006) (WordNet)

powerful
adv 1: (Southern regional intensive) very; to a great degree;
"the baby is mighty cute"; "he's mighty tired"; "it is
powerful humid"; "that boy is powerful big now"; "they
have a right nice place"; "they rejoiced mightily" [synonym:
{mighty}, {mightily}, {powerful}, {right}]
adj 1: 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" [ant:
{powerless}]
2: strong enough to knock down or overwhelm; "a knock-down blow"
[synonym: {knock-down(a)}, {powerful}]
3: having great influence [synonym: {potent}, {powerful}]
4: (of a person) possessing physical strength and weight; rugged
and powerful; "a hefty athlete"; "a muscular boxer";
"powerful arms" [synonym: {brawny}, {hefty}, {muscular},
{powerful}, {sinewy}]
5: displaying superhuman strength or power; "herculean
exertions" [synonym: {herculean}, {powerful}]