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noiseless ( Adjective)
UK/US /ˈnɔɪz.ləs/
Comparative
more noiseless
Superlative
most noiseless
1-
B1
generating minor or zero sound
-> I'm relieved to learn that noiseless automobiles exist.
-> I get more efficiency from the lesson I study in a noiseless environment.
Synonym
silent
Opposite
noisy,rackety