Etymology
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noiseless (adj.)

"making no noise, silent," c. 1600, from noise (n.) + -less. Related: Noiselessly; noiselessness. Noiseful is attested from late 14c.

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Definitions of noiseless

noiseless (adj.)
making no sound; "th' inaudible and noiseless foot of time"- Shakespeare;
From wordnet.princeton.edu