in a mighty manner; powerfully or vigorously.
to a great extent or degree; very much: to desire something mightily.

Origin of mightily

before 900; Middle English; Old English mihtiglīce. See mighty, -ly
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for mightily



to a great extent, amount, or degree
with might; powerfully or vigorously
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for mightily

Old English mihtiglice; see mighty + -ly (2).

Online Etymology Dictionary, © 2010 Douglas Harper