soundproof

adj, verb — 2 senses

soundproof

adj

Etymology From sound + -proof.

1

Not allowing sound through.

The contestant was placed in a soundproof booth so he could not receive help from the audience.
The electrical activity of the subject's cerebral cortex was recorded in a state of relative rest, after a 5 min adaptation of the subject to a dark soundproof chamber. The biopotentials were recorded from the electroencephaloscope screen […]2013, K. H. Pribram, A. R. Luria, Psychophysiology of the Frontal Lobes, page 92:

Derived terms: soundproofing

soundproof

verb

Etymology From sound + -proof.

1

To make resistant to transmitting sound.

We soundproofed the room so we couldn't hear the road noises; unfortunately we couldn't hear the fire alarm either.
It almost goes without saying that the train is fully soundproofed, with double-glazed windows and highly efficient air-conditioning by the British firm of J. Stone.1960 March, G. Freeman Allen, “Europe's most luxurious express - the "Settebello"”, in Trains Illustrated, page 141:

1 more example

Soundproofing a room may be as simple as sealing gaps around a door, or it may require rebuilding an entire wall or lowering a ceiling.1980, Robert M. Jones, editor, Walls and Ceilings, Time-Life Books, →ISBN, page 114:

Derived terms: soundproofer

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.

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Conjugation of “soundproof”, all tenses