n.[U]

1. 【物】惯性；惯量；惰性
   Inertia carried the train past the station.

   惯性使火车驶过了车站。

2. 不活动；迟钝；懒惰
   I get a feeling of inertia on a hot summer day.

   在盛夏我有一种懒洋洋的感觉。

n.

1. a tendency to do nothing or to remain unchanged.
2. Physics  a 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.
   ▸resistance to change in some other physical property:

   the thermal inertia of the oceans.