Emily Dickinson Lexicon

SOUND'LY, adv. [from sound, entire.]

1. Healthily; heartily.
2. Severely; lustily; with heavy blows; smartly; as, to beat one soundly.
3. Truly; without fallacy or error; as, to judge or reason soundly.
4. Firmly; as, a doctrine soundly settled. – Bacon.
5. Fast; closely; so as not to be easily awakened; as, to sleep soundly. – Locke.