- impervious to sound.
- to cause to be soundproof.
Origin of soundproof
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for soundproof
There would have been no birth certificates because Dugard was forced her to give birth in a soundproof structure in the backyard.Why Jaycee Dugard Should Sue
September 10, 2009
The wireless office was soundproof and practically airtight.Pincher Martin, O.D.
H. Taprell Dorling
The booth was soundproof and all the lad did was to drop coins.Whispering Wires
It was Lillian; she must have just come out of the soundproof speech-lab.
Yes, he could put up something big enough for everything the girls would need to install, and soundproof it.
But even if they had time to look it up, which they didn't, the contestant couldn't hear them in a soundproof booth.The Electronic Mind Reader
- not penetrable by sound
- (tr) to render soundproof
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012