activeness

from WordNet (r) 3.0 (2006)

activeness
    n 1: the state of being active; "his sphere of activity"; "he is
         out of action" [syn: {action}, {activity}, {activeness}]
         [ant: {inaction}, {inactiveness}, {inactivity}]
    2: 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}]

from The Collaborative International Dictionary of English v.0.48

Activeness \Ac"tive*ness\, n.
   The quality of being active; nimbleness; quickness of motion;
   activity.
   [1913 Webster]