noiseless
American Heritage Dictionary:
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noise·less
(noiz'lĭs) 
adj.
Making or marked by no noise. See synonyms at still1.
noiselessly noise'less·ly adv.
noiselessness noise'less·ness n.
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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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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Roget's II: The New Thesaurus, Third Edition by the Editors of the American Heritage® Dictionary Copyright © 1995 byHoughton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
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