American Idioms – Idiom Wizard Lists Over 5,500 Idioms & Slang Descriptions

Mental case

DEFINITION

(Crude) Disparaging reference to someone’s mental or emotional state. ‘Mental’ implies that the person has some mental illness deficiencies. (Compare to Shizo or Weirdo.)

“Did you see the weird way he acted in class today? He’s a real mental case.”

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