American English

Definition of mightily adverb from the Oxford Advanced American Dictionary

     

    mightily

     adverb
    adverb
    NAmE//ˈmaɪt̮l̩i//
     
    (old-fashioned)
     
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  1. 1very; very much mightily impressed/relieved
  2. 2 (formal) with great strength or effort We have struggled mightily to win back lost trade. They complained mightily about the way they were treated.
See the Oxford Advanced Learner's Dictionary entry: mightily