/ɪ'nɜ:ʃə; ɪn`ɝʃə/
n [U]
1 (usu derog 通常作贬义)
(a) lack of vigour; lethargy 无活力; 迟钝
*I'm unable to throw off this feeling of inertia. 我无法摆脱这种懒散的感觉.
(b) tendency to remain unchanged 惰性; 保守
*Because of the sheer inertia of the system many badly needed reforms were never introduced. 纯粹是由于制度本身有惰性, 很多事急需改革却从未实行.
2 (physics 物) property of matter by which it remains in a state of rest or, if in motion, continues moving in a straight line, unless acted upon by an external force 惯性.

n[U]
[Date: 1700-1800; Language: Latin;Origin: iners; INERT]
when no one wants to do anything to change a situation
　political inertia
technical the force that keeps an object in the same position or keeps it moving until it is moved or stopped by another force
a lack of energy and a feeling that you do not want to do anything
>inertialadj