01 adv. In a mighty manner; with might; with great earnestness; vigorously; powerfully.
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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.
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2.
To a great degree; very much.“Practical jokes amused us mightily.” — Hawthorne.