Etymology
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soundly (adv.)

c. 1400, "safely;" also "deeply" (of sleep), from sound (adj.) + -ly (2). From 1570s as "thoroughly."

updated on October 27, 2013

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Definitions of soundly from WordNet

soundly (adv.)
deeply or completely;
the baby is sleeping soundly
slept soundly through the storm
soundly (adv.)
completely and absolutely (`good' is sometimes used informally for `thoroughly');
he was soundly defeated
Synonyms: thoroughly / good
From wordnet.princeton.edu, not affiliated with etymonline.