inertness, esp. with regard to effort, motion, action, and the like; inactivity; sluggishness
the property of matter by which it retains its state of rest or its velocity along a straight line so long as it is not acted upon by an external force
a property of matter by which it remains at rest or in uniform motion in the same straight line unless acted upon by some external force
analogous property of other physical quantities (as electricity)
the tendency of a body to resist acceleration [n INERTIAE, INERTIAS] : INERTIAL [adj]
disposition to motion, exertion, or change inertness