Body has very high mass is bound to have high:

A body's tendency to resist acceleration; the tendency of a body at rest to remain at rest or of a body in motion to remain in a straight line unless acted on by an outside force. Disinclination or opposition to motion, action, or change.

A body with a high mass is bound to have a high inertia. The resistance of an object to changes in its state of motion varies with its mass.

Mass is the quantity that is solely determined by an object's inertia.

The greater an object's inertia, the greater its mass.

A heavier object is more likely to resist changes in its state of motion.