Definition of “mighty” - English Dictionary

“mighty” in British English

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mightyadjective

uk /ˈmaɪ.ti/ us /ˈmaɪ.t̬i/ literary

mightyadverb

uk /ˈmaɪ.ti/ us /ˈmaɪ.t̬i/ mainly US informal

very:

They offered to raise salaries by 15 percent - that's a mighty generous deal.

(Definition of “mighty” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)