(as) mad as a hatter/March hare
extremely silly or stupid
Thesaurus: synonyms and related words
Of unsound mind
- around the bend idiom
- bat
- batshit
- battle-scarred
- beside
- disturbed
- fruitcake
- gaga
- loon
- lose
- lunacy
- mad
- maniac
- nutcase
- off your trolley idiom
- psychopath
- schizo
- trolley
- unhinged
- wreck
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