Definition

Noun: A whimsically eccentric or crazy person; someone who behaves in a very strange or foolish way.

Usage

This is an informal and often humorous noun used to describe a person whose behavior is perceived as highly eccentric, irrational, or silly. It can be considered mildly offensive depending on the context and tone.

Examples

• He's a complete nut case; he tried to build a rocket in his backyard.
• Don't listen to him, he's a nut case.
• She felt like a nut case for talking to her plants, but it made her happy.

Advanced Usage / Nuances

• The term is often used in a hyperbolic or affectionate way among friends, not always as a serious insult.
• It emphasizes behavior that seems illogical or wildly unconventional from the speaker's perspective.

Variants and Related Words

• Nut (noun, informal): A crazy or eccentric person. (e.g., )
• Nuts (adjective, informal): Crazy, insane. (e.g., )
• Crackpot (noun): An eccentric or foolish person (often with strange ideas).
• Loon (noun, informal): A silly or crazy person.

Synonyms

• Lunatic
• Maniac
• Oddball
• Crank
• Fruitcake (informal)

Antonyms

• Sane person
• Rational person
• Conformist

Idioms / Fixed Phrases

• Drive someone nuts: To annoy or irritate someone greatly.
  • The constant noise is driving me nuts.
• Tough nut to crack: A difficult problem or person to deal with.
  • This math equation is a tough nut to crack.

Noun

1. a whimsically eccentric person