Noah Webster
Mightily
MI'GHTILY, adverb [from mighty.] With great power, force of strength; vigorously; as, to strive mightily
1. Vehemently; with great earnestness.
Cry mightily to God. Jonah 3:8.
2. Powerfully; with great energy.
Whereto I also labor, striving according to his working, which worketh in me mightily Colossians 1:29.
3. With great strength of argument.
He mightily convinced the Jews. Acts 18:28.
4. With great or irresistible force; greatly; extensively.
So mightily grew the word of God and prevailed. Acts 19:20.
5. With strong means of defense.
Fortify the power mightily Nahum 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.]