无能的英文：
inability
incapable
powerless

参考例句：

An incompetent surgeon
无能的外科医师

I think Otto is a turkey.
我认为奥托是个无能的之辈。

Criticized for his incompetent handling of the problem.
他因处理该问题无能而受到批评。

To deprive of capability or effectiveness,especially to impair the physical abilities of.
使无能力使丧失能力或使无效，尤指损害身体能力的

There is, a tendency towards slackness and inefficiency in most families that rule by hereditary right
大多数赋有世袭统治权的家族逐渐变得怠惰、无能。

Democracy substitute election by the incompetent many for appointment by corrupt few.
民主主义以由无能的大多数作出的选举来代替腐败的少数作出的委任。

He will not be able to take away the moral curse of using force by employing it halfheartedly or incompetently
半心半意或表现无能并不能使他摆脱因使用武力而引起的道义上的谴责。

British historian noted for his humorous works that ridicule the inefficiency of bureaucracies.
巴金森，西(里尔)·诺思科特生于1909英国历史学家，以讽刺官僚阶层低效无能的幽默作品而闻名。

Not worth the salt
无能;不称职

Shallowly experienced and incapable
谫陋无能

inability是什么意思：
n. 无能，无力，不能

He has difficulty in sleeping, inability to concentrate.
他不易入睡，也难集中精神。

His inability to speak French puts him at a disadvantage.
他不会说法语,这使他很吃亏.

Having or showing an inability to foresee what will happen
目光短浅的;无远见的

incapable是什么意思：
adj. 不能的，不能胜任的

lacking the ability needed;incapable
不胜任的;无能力的

Their main limitation is that they are incapable of rising to the ionosphere
他们主要局限性是不能上升到电离层。

Their main limitation is that they are incapable of rising to the ionosphere.
它们的主要局限性是无法上升至电离层。

powerless是什么意思：
a. 无力的,无权的,无效能的

I am powerless to intervene in the matter.
我对调停此事无能为力。

See how powerless is the human will against predestination!
请看人类反抗命运的意志是多么脆弱无力啊！

The authorities seem powerless to stem the rising tide of violence.
当局似乎无力阻止愈演愈烈的暴力活动。