What is another name for a crazy insane person?

Answer 1

In casual, typically abusive and incorrect language, synonyms include nerd, loony, fool, idiot, nitwit, and many others.

In medical science and psychiatry, patients would typically be referred to as mentally ill persons, unless a more precise term for their respective illness can be used.

In literature, the fool often plays the role of the wise commentator in disguise, who only appears to be without his (or her) wits, but in fact is a sharp observer, commentator, and sometimes even advisor.

Answer 2

Another term for a crazy insane person might be "mentally disturbed" or "psychotic." It is important to use respectful language when discussing mental health.