Synonyms for soundproof
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EXAMPLES FROM THE WEB FOR SOUNDPROOF
The wireless office was soundproof and practically airtight.
The booth was soundproof and all the lad did was to drop coins.
It was Lillian; she must have just come out of the soundproof speech-lab.
Yes, he could put up something big enough for everything the girls would need to install, and soundproof it.
But even if they had time to look it up, which they didn't, the contestant couldn't hear them in a soundproof booth.
They were within ten yards of the plane when a wail of anguish was born—and died—in two soundproof helmets.