Tendency not to move; lack of activity; sluggishness.

惰性；缺乏活动；迟钝。

That property by virtue of which matter tends to remain at rest, resting, or, if moving, to move uniformly in the same straight line unless it is acted upon by some outside force.

【理】惯性。凡物体静者恒静，动者如无外力以阻止之，则恒依其直线方向等速进行，永无止境。