Definify.com
Webster 1913 Edition
Mightily
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 1828 Edition
Mightily
MI'GHTILY
,adv.
1.
Vehemently; with great earnestness. Cry mightily to God. Jonah 3.
2.
Powerfully; with great energy. Whereto I also labor, striving according to his working, which worketh in me mightily. Col.1.
3.
With great strength of argument. He mightily convinced the Jews. Acts.18.
4.
With great or irresistible force; greatly; extensively. So mightily grew the word of God and prevailed. Acts.19.
5.
With strong means of defense. Fortify the power mightily. Nah.2.
6.
Greatly; to a great degree; very much. I was mightily pleased with a story applicable to this piece of philosophy.
[Admissible in colloquial and familiar language.]