I think you are mentally tired.

我觉得你的脑子累了。

the way the person functions physically, emotionally and mentally at work.

那个人在工作中发挥其生理、情感和智力功能的方式。

an inmate who is mentally disturbed.

一个心理不正常的病人。

the needs of the mentally ill.

精神病患者的需要。

This technique will help people mentally organize information.

这个技术会帮助人们在头脑里组织信息。