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English definition of “soundproof”

soundproof

adjective uk   /ˈsaʊnd.pruːf/ us  
(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] uk   us  
It was a well soundproofed building, so we didn't hear the traffic outside.Sound and its properties
soundproofing
noun [U] uk   /-ˌpruː.fɪŋ/ us  
Sound and its properties
(Definition of soundproof from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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