powerful

(r) (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
mighty, mightily, right,
(a) 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
(s) strong enough to knock down or overwhelm
- a knock-down blow
knock-down,
(s) having great influence potent,
(s) (of a person) possessing physical strength and weight; rugged and powerful
- a hefty athlete
- a muscular boxer
- powerful arms
brawny, hefty, sinewy, muscular,
(s) displaying superhuman strength or power
- herculean exertions
herculean,

mighty mightily right knock-down potent brawny hefty sinewy muscular herculean

powerless

powerfully powerfulness