The Collaborative International Dictionary of English v.0.48:
Inertness \In*ert"ness\, n. 1. Lack of activity or exertion; habitual indisposition to action or motion; sluggishness; apathy; insensibility. --Glanvill. [1913 Webster] Laziness and inertness of mind. --Burke. [1913 Webster] 2. Absence of the power of self-motion; inertia. [1913 Webster]WordNet (r) 3.0 (2006):
inertness n 1: immobility by virtue of being inert