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/ advShe's mentally ill.她有精神病。