The Collaborative International Dictionary of English v.0.48:
Soundly \Sound"ly\, adv. In a sound manner. [1913 Webster]WordNet (r) 3.0 (2006):
soundly adv 1: deeply or completely; "slept soundly through the storm"; "the baby is sleeping soundly" 2: completely and absolutely (`good' is sometimes used informally for `thoroughly'); "he was soundly defeated"; "we beat him good" [syn: thoroughly, soundly, good]