Still'ness, n.
n. 1. The state or quality of being still; freedom from noise, motion, agitation, excitement, and the like; calmness; quiet; silence; as, the stillness of the night, the air, or the sea; the stillness of the passions.
Sense 2. Habitual silence; taciturnity.
The gravity and stillness of your youth The world hath noted. Shak.