the.com/liveliness
The visible proof that something inside is awake and refuses to sit still.
means The quality of being full of energy, spirit, and brisk activity.
from From Old English lif (life) plus -ly, capped with -ness — literally the state of being life-like, animated rather than merely breathing.
Music termVivace means lively, faster than allegro.
Root logicSame lif gives us alive and lifelong.
Old senseOnce meant vividness of color and image too.