in·ac·tiv·ity /(ˌ)ɪnˌækˈtɪvətɪ/ 名詞
1. The state or quality of being inactive; inertness; as, the inactivity of matter.
2. Idleness; habitual indisposition to action or exertion; lack of energy; sluggishness.
The gloomy inactivity of despair. --Cook.
n 1: the state of being inactive [syn: inaction, inactiveness]
[ant: action, action, action]
2: a disposition to remain inactive or inert; "he had to
overcome his inertia and get back to work" [syn: inactiveness,
inertia] [ant: activeness]
3: being inactive; being less active [ant: activity]