'activeness' definitions:

Definition of 'activeness'

From: WordNet
noun
The state of being active; "his sphere of activity"; "he is out of action" [syn: action, activity, activeness] [ant: inaction, inactiveness, inactivity]
noun
The trait of being active; moving or acting rapidly and energetically; "the level of activity declines with age" [syn: activeness, activity] [ant: inactiveness, inactivity, inertia]