soundly

/ˈsaʊndli/

/ˈsaʊndli/

When something is done soundly, it's done in a firm, solid, or complete way. If the opposing kickball team beats your team 23 to zip, you could say that they defeated you soundly.

Something that is soundly built is sturdy. If your deck isn't made soundly, you may be understandably nervous to stand on it. When you sleep soundly, you rest very deeply. This last use of the word comes from a definition of sound dating from the mid-16th century and used only for sleep: "undisturbed."

Definitions of soundly

1. adverb

   completely and absolutely (`good' is sometimes used informally for `thoroughly')
   “he was soundly defeated”

   synonyms: good, thoroughly
2. adverb

   deeply or completely
   “slept soundly through the storm”

   “the baby is sleeping soundly”