soundproof

American  

[sound-proof] / ˈsaʊndˌpruf /

adjective

1. impervious to sound.

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verb (used with object)

1. to cause to be soundproof.

soundproof British  

/ ˈsaʊndˌpruːf /

adjective

1. not penetrable by sound

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verb

1. (tr) to render soundproof

Other Word Forms

• soundproofing noun

Etymology

Origin of soundproof

First recorded in 1875–80; sound ¹ + -proof

Example Sentences

In the summer of 2012, prosecutors say, one of those bedrooms was soundproofed.

From The Wall Street Journal

Initial findings from the investigation into the blaze suggest that it was caused by sparklers igniting soundproof foaming that lined the ceiling.

From BBC

Initial findings suggest that the fire was caused by sparklers coming into contact with soundproofing foam installed on the ceiling of the establishment's basement.

From Barron's

Covered with soundproofing foam that was never safety tested, it ignites quickly.

From BBC

There has been much focus on the soundproofing foam, which, according to photos taken by the owners, had been added during renovations in 2015.

From Barron's