Ĭn′/ae-tĭv′ĭ-ty, n.
n. [Prefix in, not, and activity; Fr. inactivité, Sp. inactividad, It. inattività.]
Sense 1. The quality of being inactive; inertness; as, the inactivity of matter.
Sense 2. Idleness; indisposition to action or exertion; want of energy; sluggishness. “The gloomy inactivity of despair.” Cook.