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  1. impervious to sound.
verb (used with object)
  1. to cause to be soundproof.

Origin of soundproof

First recorded in 1875–80; sound1 + -proof
Related formssound·proof·ing, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for soundproof

Contemporary Examples

Historical Examples

  • 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</p>

    Henry Leverage

  • It was Lillian; she must have just come out of the soundproof speech-lab.


    H. Beam Piper

  • Yes, he could put up something big enough for everything the girls would need to install, and soundproof it.


    H. Beam Piper

  • But even if they had time to look it up, which they didn't, the contestant couldn't hear them in a soundproof booth.

British Dictionary definitions for soundproof


  1. not penetrable by sound
  1. (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

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