a disposition to remain inactive or inert
"he had to overcome his inertia and get back to work"
(physics) the tendency of a body to maintain its state of rest or uniform motion unless acted upon by an external force
"The car required several seconds of braking before it finally stopped moving due to inertia."
The property of a body that resists any change to its uniform motion; equivalent to its mass.
"The heavy truck's massive inertia made it difficult for the driver to bring the vehicle to a sudden stop on the icy road."