Inertia is the property of a body due to which it remains or tends to remain in the state of rest are uniform motion in a straight line unless an unbalanced forces act on it.
Inertia of rest is the property of the body by virtue of which it remains or tends to remain in the state of rest unless unbalanced force acts on it.
Inertia of motion is the property of a body by virtue of which it remains are tends to remain in the state of uniform motion in a straight line unless unbalanced forces act on it.
Inertia of direction is the property of a body by virtue of which it maintains or tends to maintain its direction of motion unless unbalanced forces act on it.