noiseless

[noiz-lis]
adjective
accompanied by or making little or no noise; silent; quiet: a noiseless step; a noiseless typewriter.

Origin:
1595–1605; noise + -less

noiselessly, adverb
noiselessness, noun


inaudible, soundless. See still1.
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World English Dictionary
noiseless (ˈnɔɪzlɪs)
 
adj
making little or no sound; silent
 
'noiselessly
 
adv
 
'noiselessness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Many fewer random samples are needed for the noiseless phantom, but gives much poorer results with the noisy phantom.
The use of paperless, noiseless, battery-operated or solar calculators is permitted.
Respiration may be noiseless or there may be a wheezing, rattling, or clicking sound.
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