1. (a.) Full of power; capable of producing great effects of any kind; potent; mighty; efficacious; intense; as, a powerful man or beast; a powerful engine; a powerful argument; a powerful light; a powerful vessel.

2. (a.) Large; capacious; -- said of veins of ore.

absolute acid armipotent ascendant authoritarian authoritative authorized autocratic beefy biting bouncing charismatic charming clothed with authority cogent commanding compelling competent comprehensive consequential considerable controlling corrosive cutting deep dominant doughty driving duly constituted dynamic effective effectual efficacious eminent empowered enchanting energetic estimable ex officio exhaustive forceful forcible forcy formidable full full-blooded full-strength governing grand grave great gutsy gutty hale hard hard as nails hardy hearty heavy hefty hegemonic hegemonistic high high-potency high-powered high-pressure high-tension husky imperative important impressive in force in power incisive influential intense iron-hard irresistible leading lusty magnetic main maximum mighty mighty in battle momentous monocratic mordant nervous nervy obstinate official operative penetrating personable persuasive piercing plenary poignant potent preeminent prepotent prestigious prominent puissant punchy ranking red-blooded reputable resilient robust robustious rugged ruling senior sensational serious sinewed sinewy slashing stalwart steely stout strapping striking strong strong as brandy strong as strong strong-willed sturdy suasive substantial superior supreme telling total totalitarian tough trenchant valid vigorous vital weighty winning