adj.无能力的;不胜任的;不适当的;
n.无能者;不胜任者;
例句:
He's incompetent, he'll have to go.
他不称职, 得辞掉他.
The man was a fool, he thought, or at least incompetent.
他想道,那人是个傻瓜,或者说,至少很无能。
I was incompetent at playing the piano.
我钢琴弹得不好。