noiselessly
Word family
Synonym discussion
Sense: adverb/1
All four words describe a lack of sound, but they differ in register and shade of meaning. 'Silently' is the most general and everyday term — you would say a person sat silently, or a phone vibrated silently. 'Noiselessly' is more literary and often implies that the absence of noise is noteworthy or surprising, especially for machines or movement that one would expect to make sound. 'Quietly' is the broadest: it covers both 'low volume' and 'complete silence', so it fits situations where some sound is still present. 'Soundlessly' is the rarest and most dramatic of the group, appearing in descriptive or narrative prose to emphasise total silence. For example: 'She closed the door quietly' (perhaps a soft click remained), 'She closed the door noiselessly' (no sound at all, carefully done), and 'The snake moved soundlessly through the grass' (no rustling whatsoever).
Common collocations
Etymology
Formed within English from 'noiseless' (the adjective 'noise' + the suffix '-less', meaning 'without noise') + the adverb-forming suffix '-ly'. The noun 'noise' traces back through Old French 'noise' (meaning noise, quarrel, or disturbance) to Latin 'nausea' (seasickness, discomfort) — a surprising origin for a word about sound.