1. lacking the skill, knowledge, or ability to do something; unqualified or unfit to perform a specific task or duty
He was deemed incompetent to stand trial.
Ele foi considerado incompetente para estar em julgamento.
2. legally or professionally unqualified to handle a particular matter or responsibility
The court ruled that she was incompetent to manage her own affairs.
O tribunal decidiu que ela era incompetente para gerir os seus próprios assuntos.