incompetence

他被解雇了，因为他在工作中表现出了明显的能力不足。

He was fired for showing clear ___incompetence in his work.

由于他的无能，他被解除了职务。

He was removed from his position due to his ___incompetence.

由于他在项目中的无能表现，公司决定更换项目负责人。

The company decided to replace the project leader due to his ___incompetence in handling the tasks.