different between noiselessly vs mutely

English

noiseless +? -ly

noiselessly (not comparable)

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.
- 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.

mute +? -ly

mutely (comparative more mutely, superlative most mutely)

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