mentally ill

英 [ˈmentəli ɪl]

美 [ˈmentəli ɪl]

患精神病的

牛津词典

以上各词均用以形容患有精神疾病的人。
These words all describe sb who is suffering from a mental illness.
指有精神病
suffering from an illness of the mind, especially in a way that affects the way you think and behave
指精神失常、神经错乱：
[not usually before noun] ( rather formal ) suffering from a serious mental illness and unable to live in normal society
1. 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？
指神经机能病的、神经官能症的：
( medical ) suffering from or connected with neurosis (= a mental illness in which a person suffers strong feelings of fear and worry)
1. the treatment of anxiety in neurotic patients
  对神经官能症病人焦虑感的治疗
指精神错乱的、有精神病的
( medical ) suffering from or connected with psychosis (= a serious mental illness in which thought and emotions lose connection with external reality)
指有精神病的、心理不正常的、精神紊乱的，尤因不幸或受刺激所致：
mentally ill, especially because of very unhappy or shocking experiences
1. He works with emotionally disturbed children.
  他从事跟精神异常儿童有关的工作。
指情绪、行为反复无常的、不稳定的
having emotions and behaviour that are likely to change suddenly and unexpectedly

adj