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

Many nightclub fires share a common factor: flammable soundproofing foam and interior finishes that cover much of the space and can ignite easily.

From The Wall Street Journal

The sparks appear to set fire to the ceiling, which was covered with foam for soundproofing, and the flames spread very quickly.

From BBC

The mini-fireworks were being waved near the basement bar's low wooden ceiling, covered in thin soundproofing fabric, according to the images on social media.

From Barron's