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Synonyms
pow·er·ful (poúər-fəl)

adjective 

  1. Having or capable of exerting power.
  2. Effective or potent: a powerful drug.
  3. Chiefly Upper Southern U.S. Great: “ a powerful lot to say about faith and good works and free grace and preforeordestination, and I don't know what all” (Mark Twain)

adverb 

Chiefly Upper Southern U.S.
Very: It was powerful humid.

derivatives

poẃer·ful·ly
adverb
poẃer·ful·ness
noun