noun · the tendency to continue acting, thinking, or doing things in an accustomed way; behavioral or cognitive momentum

他已经退休了，但由于职业惯性，每天还是早早起床。

noun · the physical property of matter by which it continues in its existing state of rest or uniform motion in a straight line unless changed by an external force

汽车紧急刹车时，乘客由于惯性会向前倾。