sound proofed

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
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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
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