MI'GHTILY, adv. [from mighty.] With great power, force of strength; vigorously; as, to strive mightily.
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.]