noiseless

(noiz'lĭs)
adj.
Making or marked by no noise. See synonyms at still¹.

noiselessly noise'less·ly adv.
noiselessness noise'less·ness n.

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adjective

Marked by, done with, or making no sound or noise: hushed, quiet, silent, soundless, still, stilly. Archaic hush. See sounds/pleasant sounds/unpleasant sounds/neutral sounds or silence.

adj

Definition: quiet
Antonyms: clamorous, noisy