inertia

The tendency of a body at rest to remain at rest or of a body in straight line motion to stay in motion in a straight line unless acted on by an outside force; the resistance of a body to changes in momentum.

Resistance or disinclination to motion, action, or change.

Lack of activity; sluggishness; passiveness; inertness.

In physics, that property of matter by virtue of which it retains its state of rest or of uniform rectilinear motion so long as no foreign cause changes that state. Also called vis inertiæ (force of inertia).

In medicine, want of activity; sluggishness: a term especially applied to the condition of the uterus when it does not contract properly in parturition.