a. сильний, могутній, переконливий, яскравий, міцносилий, можний

having great power or force or potency or effect: regent, effective, efficacious, stiff, regnant, puissant, almighty, potent, reigning, power, powerfulness, effectual, compelling, muscular, all-powerful, ruling, coercive, mighty, strong, omnipotent
having unlimited power: almighty, powerful, omnipotent
having great influence: influential, potent
strong enough to knock down or overwhelm: strong, knock-down
(of a person) possessing physical strength and weight; rugged and powerful: sinewy, hefty, muscular, brawny, strong
(Southern regional intensive) very; to a great degree: right, mighty, mightily
displaying superhuman strength or power: superhuman, herculean