MIGHTILY

Source: 566, 567

mightily. Mightily, ad. powerfully, strongly, vigorously

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Might″i‐ly (?), adv. [[From Mighty.]] 1. 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. 2. To a great degree; very much.
Practical jokes amused us mightily. Hawthorne.