The walls were soundproof, blocking out all external noise.
quiet
Frequency:
70
%
The noiseproof windows kept the room quiet and peaceful.
insulation
Frequency:
65
%
The insulation in the room made it completely noiseproof.
acoustic
Frequency:
60
%
The acoustic panels on the walls made the room noiseproof.
Idiomatic Expressions for noiseproof
Phrase: noiseproof room
Meaning: a room that is soundproof or insulated from external noise
Usage: The recording studio has a noiseproof room for musicians to record in peace.