In`ac*tiv"i*ty (?), n. [Cf. F. inactivit'e.]
1.
The state or quality of being inactive; inertness; as, the inactivity of matter.
2.
Idleness; habitual indisposition to action or exertion; want of energy; sluggishness.
The gloomy inactivity of despair.
Cook.
© Webster 1913.