powerful

adj

1.
having great power or force or potency or effect
Antonym:
powerless
Derived from:
powerfulness
2.
strong enough to knock down or overwhelm
knock-down
3.
having great influence
potent
Derived from:
powerfulness
4.
(of a person) possessing physical strength and weight; rugged and powerful
brawny hefty muscular sinewy
5.
displaying superhuman strength or power
herculean
Derived from:
powerfulness