noiselessly (not comparable)

1. In a quiet manner, without any noise.
   • 1912: Edgar Rice Burroughs, Tarzan of the Apes, Ch.5:

     Not thirty paces behind the two she crouched--Sabor, the huge lioness--lashing her tail. Cautiously she moved a great padded paw forward, noiselessly placing it before she lifted the next. Thus she advanced; her belly low, almost touching the surface of the ground--a great cat preparing to spring upon its prey.

   • 1920, Mary Roberts Rinehart; Avery Hopwood, chapter I, in The Bat: A Novel from the Play (Dell Book; 241), New York, N.Y.: Dell Publishing Company, OCLC 20230794 ↗, [https://babel.hathitrust.org/cgi/pt?id=hvd.hwptej;view=1up;seq=5 page 01]:

     The Bat—they called him the Bat. Like a bat he chose the night hours for his work of rapine; like a bat he struck and vanished, pouncingly, noiselessly; like a bat he never showed himself to the face of the day.

• quietly, silently, inaudibly

• noisily

• noise
• noiseless
• noisily
• noisy

• French: sans bruit
• German: geräuschlos
• Portuguese: sem fazer barulho
• Russian: бесшу́мно