Quiet
What it means
Meaning 1
Making little sound or creating freedom from intrusive noise.
Reach for it when describing a place, activity, or voice with low sound
The quiet room gave readers enough stillness to concentrate.
Meaning 2
Reserved and unobtrusive in manner rather than eager for attention.
Reach for it when describing a person whose low-key presence should not be mistaken for disengagement
The quiet volunteer listened closely and sent the clearest follow-up notes.