sound·proof

[sound-proof]
adjective
1.
impervious to sound.
verb (used with object)
2.
to cause to be soundproof.

Origin:
1875–80; sound1 + -proof

sound·proof·ing, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
soundproof (ˈsaʊndˌpruːf) [Click for IPA pronunciation guide]
 
adj
1.  not penetrable by sound
 
vb
2.  (tr) to render soundproof

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Soundproof is one of our favorite verbs.
So is hornswoggle. Does it mean:
to flee; abscond:
to swindle, cheat, hoodwink, or hoax.
Example sentences
We have two soundproof recording booths and digital recording equipment.
With this methodology, participants are seated in a soundproof booth and
  different tones are presented through headphones.
Each trial courtroom shall have a soundproof jury deliberation room located in
  a quiet area as near the courtroom as possible.
They are furnished, often tiled and were air-conditioned with electricity from
  soundproof generators.
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