incompetent

名词 incompetent:

1. someone who is not competent to take effective action
   同义词：incompetent person

形容词 incompetent:

1. not qualified or suited for a purpose
2. showing lack of skill or aptitude
   同义词：bungling, clumsy, fumbling
3. not doing a good job
   同义词：unskilled
4. not meeting requirements
   同义词：incapable, unequal to

1. He's incompetent and not worth keeping on.
   他庸碌无能，不值得留用。
2. She was put off maths by a bullying and incompetent teacher.
   她对数学失去了兴趣，因为老师仗势欺人又没教学能力。
3. He's incompetent; he'll have to go.
   他不称职，得辞掉他。
4. You incompetent bungler!
   你这个成事不足败事有余的家伙！
5. An incompetent person.
   无能力者，不胜任的人

in.com.pe.tent

adj.（形容词）
Not qualified in legal terms:
法律上无资格的：
例句：
a defendant who was incompetent to stand trial.
无资格受审的被告

Inadequate for or unsuited to a particular purpose or application.
不足的，不适合的：对某一计划或应用不适合或不适当的
Devoid of those qualities requisite for effective conduct or action.
无能的，不适任的：对有效的指导或行动缺乏应有的能力
n.（名词）
An incompetent person.
无能力者，不胜任的人

【引伸】
incom.petence 或
incom.petency
n.（名词）
incom.petently
adv.（副词）