Definition & Meaning of "Mad as a hatter"

(as) mad as a hatter

/az mˈad az ɐ hˈatə mˈɑːtʃ hˈeə/

/æz mˈæd æz ɐ hˈæɾɚ mˈɑːɹtʃ hˈɛɹ/

(as) mad as a hatter

PHRASE

used to refer to someone who is in a very chaotic state of mind and is behaving very abnormally

(as|) mad as a (hatter|March hare) definition and meaning

What is the origin of the idiom "mad as a hatter" and when to use it?

The idiom "mad as a hatter" dates back to the 19th century and is associated with the hat-making industry. This phrase is used to describe someone who is acting extremely eccentric, irrational, or mentally unstable.

Example

In the past, people sometimes attributed eccentric behavior to being as mad as a hatter, unaware of the toxic effects of mercury exposure.

If she continues exploring her creative ideas, her art might become as unique and brilliant as that of someone mad as a March hare.

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