1. mightily

usage: powerfully or vigorously; "he strove mightily to achieve a better position in life"

2. mighty, mightily, powerful, right

usage: (Southern regional intensive) very; to a great degree; "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"; "they rejoiced mightily"

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See also: mightily (Dictionary)