Soundproof

Adjective

 * 1) Describing something that does not allow sound through.
 * The contestant was placed in a soundproof booth so he could not receive help from the audience.

Derived terms

 * soundproofing

Verb

 * 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.

Thesaurus
airtight, ballproof, bombproof, bulletproof, burglarproof, corrosionproof, dampproof, fire-resisting, fireproof, flameproof, foolproof, hermetic, holeproof, impervious to, insulate, leakproof, noiseproof, proof, proof against, punctureproof, resistant, rustproof, shatterproof, shellproof, tight, waterproof, watertight, weatherproof