名詞 inertia:

1. a disposition to remain inactive or inert
   同義詞：inactiveness, inactivity
2. (physics) the tendency of a body to maintain is state of rest or uniform motion unless acted upon by an external force

1. Ideas of inertia and complacency are both wrong.
   無所作為和驕傲自滿的論點都是錯誤的。
2. Because of the sheer inertia of the system many badly needed reform is never introduced.
   純粹是由於制度本身有惰性，很多事急需改革卻從未實行。
3. The inertia of an entrenched bureaucracy.
   平穩(wěn)的官僚機構(gòu)內(nèi)存在的惰性

in.er.tia

n.（名詞）
Physics The tendency of a body to resist acceleration; the tendency of a body at rest to remain at rest or of a body in motion to stay in motion in a straight line unless acted on by an outside force.
【物理學】 慣性：物體抗拒加速的傾向；在沒有外力作用的情況下，靜止的物體保持靜止狀態(tài)的傾向，或運動著的物體保持勻速直線運動的傾向
Resistance or disinclination to motion, action, or change:
惰性；遲鈍：拒絕或不情愿運動、行動或變化：
例句：
the inertia of an entrenched bureaucracy.
平穩(wěn)的官僚機構(gòu)內(nèi)存在的惰性

來源：
Latin [idleness]
拉丁語 [遲鈍]
from iners inert- [inert] * see inert
源自 iners inert- [遲緩的] *參見 inert

【引伸】
iner.tial
adj.（形容詞）
iner.tially
adv.（副詞）