noiselessly

This was bone-chilling, to be approached so noiselessly by a winged assassin.

Ryan Drummond, standing noiselessly at the top of the stairs, was sure he knew who it was.

Cell doors shut noiselessly, with the silence only broken when guards use clacking devices or banged metal pipes to warn colleagues that they were escorting a suspect to avoid meeting others.

He was not the dangerous one, the girl knew, but his mate who padded noiselessly through the trees.

The next day, I enter the music room noiselessly.