The Oxford Thesaurus An A-Z Dictionary of Synonyms - mightyadj.

1) powerful, strong, potent, influential, dominant, predominant, ascendant, weighty, doughty, authoritarian, autocratic, indomitable: The pen is mightier than the sword. He should have thought twice before challenging such a mighty opponent. 2) strong, muscular, powerful, robust, strapping, sturdy, brawny, burly, well-built, able-bodied, hardy, Colloq husky, hefty: The smith a mighty man was he, With large and sinewy hands. 3) big, large, huge, grand, great, enormous, gigantic, tremendous, towering, monumental, prodigious, massive, bulky: The giant plucked a mighty tree from the earth and flung it across the sea. --adv. 4) very, extremely: It was mighty nice of you to visit me here in the Ozarks.