'Mightily' definitions:

Definition of 'mightily'

(from WordNet)
adverb
Powerfully or vigorously; "he strove mightily to achieve a better position in life"
adverb
(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" [syn: mighty, mightily, powerful, right]

Definition of 'Mightily'

From: GCIDE
  • Mightily \Might"i*ly\, adv. [From Mighty.]
  • 1. In a mighty manner; with might; with great earnestness; vigorously; powerfully. [1913 Webster]
  • Whereunto I also labor, striving according to his working, which worketh in me mightily. --Col. i. 29. [1913 Webster]
  • 2. To a great degree; very much. [1913 Webster]
  • Practical jokes amused us mightily. --Hawthorne. [1913 Webster]