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English definition of “soundproof”

soundproof

adjective     /ˈsaʊnd.pruːf/
(of a building or part of a building) not allowing sound to go through: a soundproof room/wall/studioSound and its properties soundproof     verb [T] It was a well soundproofed building, so we didn't hear the traffic outside.Sound and its properties soundproofing     /-ˌpruː.fɪŋ/ noun [U] Sound and its properties
(Definition of soundproof adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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