Adjective mighty has 1 sense
  1. mighty - having or showing great strength or force or intensity; "struck a mighty blow"; "the mighty logger Paul Bunyan"; "the pen is mightier than the sword"- Bulwer-Lytton
    Antonyms:
    powerless, weak (indirect, via powerful)
,Adverbial mighty has 1 sense
  1. mighty, powerful, right - (Southern regional intensive) very; "the baby is mighty cute"; "he's mighty tired"; "it is powerful humid"; "that boy is powerful big now"; "they have a right nice place"
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