Definition of "sound-proof" [sound-proof]

• Impervious to sound; preventing the entrance of sounds.

The Century Dictionary (Public Domain)

• "If a tree falls in the woods and the only there is inside a sound-proof bubble, does it make a sound?"
• "Facebook knows what I like, although recently it seems to think that I want Kim Kardashian to sell me shoes, whereas what I actually want is for Kim Kardashian to be sealed underground in a sound-proof box and removed from the radio."
• "I'd get my chance to bark blessed thanks to him ... once we were safe, in our sound-proof car -- on the road to recovery again."