Powerful Synonyms, Powerful Antonyms | Merriam
powerful (adj.) c. 1400, from power (n.) + -ful. Meaning 'of great quality or number' is from 1811; colloquial sense of 'exceedingly' (adv.) is from 1822. Related: Powerfully. Thornton ('American Glossary') notes powerful as 'Much used by common people in the sense of very,' along with monstrous and cites curious expressions such as devilish good, ...
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