1 connected with or happening in the mind; involving the process of thinking 与精神、心智、思想或思考有关的: It's fascinating to watch a child's mental development. 观察儿童的心智发展是很有趣的。

2 connected with illness of the mind 与精神病有关的: a mental disorder/illness 精神错乱﹔精神病 ➔mentally /ˈmentəli ||; ˈmɛntḷɪ/ adv She's mentally ill. 她有精神病。