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