incompetent

无能的、不胜任的、能力不足的

The manager was simply incompetent and lost the team's trust.

那位主管根本就是无能，失去了团队的信任。

拙劣的、差劲的

The repairs were so incompetent that the roof leaked again.

修缮工程做得太差劲，屋顶又开始漏水了。

无行为能力的、无资格的法律

The court ruled that he was mentally incompetent to stand trial.

法院裁定他心智状况无能力接受审判。

无能的人、庸才

He dismissed his critics as a bunch of incompetents.

他把批评他的人一概说成是一群庸才。