Definition of noiselessly adverb from the Oxford Advanced Learner's Dictionary

 

noiselessly

 adverb
adverb
BrE BrE//ˈnɔɪzləsli//
 
; NAmE NAmE//ˈnɔɪzləsli//
 
(formal)
 
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without making any noise; making only a small amount of noise synonym silently (2) She slipped noiselessly out of the room.