What is the meaning of the word "nutcase"?

Definitions:

  1. Describes a person who behaves in a way that is considered wildly irrational or crazy. copy to clipboard NOUN
    • We encountered a nutcase on the subway who was yelling about aliens invading Earth. copy to clipboard
  2. Refers to someone whose actions or thoughts seem very unusual or eccentric. copy to clipboard NOUN
    • My neighbor is a bit of a nutcase; he spends his days talking to his plants. copy to clipboard

Synonyms: