soundly

from 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}]

from The Collaborative International Dictionary of English v.0.48

Soundly \Sound"ly\, adv.
   In a sound manner.
   [1913 Webster]