mentally ill, especially because of very unhappy or unpleasant experiences 有精神病的；心理不正常的；精神紊乱的
a special school for emotionally disturbed children为精神异常儿童开办的特殊学校
His behaviour is deeply disturbed.他的行为极其失常。
Which Word? Talking about mental healthTalking about mental health
Do not use the words mad or crazy to describe somebody who is suffering from a real mental illness. Say instead that somebody has mental health issues/problems or is mentally ill:
I have experienced mental health issues since the age of 14.我从14岁开始就经历了心理健康问题。
a charity that helps mentally ill people live independently帮助精神病患者独立生活的慈善机构
Disturbed can be used to describe somebody who has mental health issues because of very unhappy or unpleasant experiences:
He works with emotionally disturbed children.他从事跟精神异常儿童有关的工作。
Insane is a formal or old-fashioned term used to describe somebody suffering from a serious mental illness and unable to live in normal society:
The question is, was the man insane when he committed the crime?问题在于这男人犯罪时是否处于精神失常状态？
However, insane is more often used in informal English to describe somebody who is not suffering from a mental illness, but whose mind does not work normally, especially because they are under pressure. This meaning is used in the phrases go insane and drive somebody insane.
Extra Examples
Many of our patients are severely disturbed.我们的许多病人精神严重失常。
Some of the people on the ward are very disturbed.病房里有些人很不安。
Their father seems to be seriously disturbed.他们的父亲似乎受到了严重困扰。