1) Immobility 2) Noble-gas property 1) Inactivity 2) Inertitude 3) Insensibility 
• (n.) Want of activity or exertion; habitual indisposition to action or motion; sluggishness; apathy; insensibility. • (n.) Absence of the power of self-motion; inertia.
In·ert'ness noun 1. Want of activity or exertion; habitual indisposition to action or motion; sluggishness; apathy; insensibility. Glanvill. « Laziness and inertness of mind.» Burke. 2. Absence of the power of self-motion; inertia. 
[n] - immobility by virtue of being inert
inertness 1. Not moving or not able to move. 2. Not readily changed by chemical or biological reaction. 3. Lacking in energy or motivation.
noun immobility by virtue of being inert