noiselessactivity
nounUK /ˈnɔɪzləs ækˈtɪvəti/
US /ˈnɔɪzləs ækˈtɪvəti/
Doing something without making any sound.
Reading a book is a noiseless activity.
OTHER MEANINGS
2. A task done in a way that makes no noise.
Tiptoeing past the baby's room is a noiseless activity.
3. Work that does not disturb others with sound.
Drawing at her desk was a noiseless activity during class.
4. An action performed silently on purpose.
The spy's noiseless activity kept everyone from noticing him.