The noiseless night was interrupted by a distant siren.
movement
Frequency:
45
%
He made a noiseless movement towards the door.
operation
Frequency:
30
%
The machine worked in a noiseless operation.
Idiomatic Expressions for noiseless
Phrase: quiet as a mouse
Meaning: Extremely quiet or making very little noise.
Usage: The children were quiet as a mouse as they snuck past their sleeping parents.