stark staring mad
barking mad
crazy as a cootie
crazy as a cootie bug
stark raving mad
cracked as an egg
off one's head
out of one's mind
deranged
nutballs
insano
loony
potty
off the rails
loco
nutso
psycho
crackers
hatstand
off one's chump
lunatical
bughouse
insaniac
lunatic
mentalist
not wise
loony tunes
mooner
insane in the membrane
gelt
drive someone crazy
off the beam
off one's onion
off one's rocker
nutzoid
go mad
gone fishing
gobaloon
madly
crazily
insanely
dementedly
Ophelian
mad
maniac
mad as a box of frogs
demented
madman
nutcase
hystericize
crazy as a bedbug
nuts
not right in the head
meshuggener
lima bean
maniacal
insanity
maniacally
daft
go potty
lose one's mind
becrazed
insanitarily
over the river and through the woods
cooked
unglued
lunatically
nucking futs
jimjam
hysterically
doolally
non compos mentis
insaneness
overhysterical
crazy as a shithouse rat
looney tunes
lunatize
cuckoo for Cocoa Puffs
maddening
psychotically
crazedly
crack up
bananapants
mad as a March hare
over the edge
reality challenged
mad person
lose it
crazy-ass
phrenesis
half-crazed
hysterization
crazed
one brick short of a full load
crazo

English words for 'Completely insane; out of one's mind.'

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