nutty as a fruitcake
Adjective
Meaning
nutty as a fruitcake (not comparable)
(simile, colloquial) Behaving in an eccentric, foolish, or kooky manner; very nutty.
Synonyms
loco
dotty
mad
gonzo
crazy
wacky
zany
barmy
loopy
round the bend
certifiable
non compos mentis
around the bend
daffy
nuttier than squirrel shit