soundproof

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

Origin:
1875–80; sound1 + -proof

soundproofing, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
soundproof (ˈsaʊndˌpruːf)
 
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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Example sentences
With this methodology, participants are seated in a soundproof booth and
  different tones are presented through headphones.
As expected, birds raised in soundproof boxes grew up to sing cacophonous songs.
They are furnished, often tiled and were air-conditioned with electricity from
  soundproof generators.
It was useful because it made these materials fireproof, soundproof and sturdy.
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