crazy
batchy
few sandwiches short of a picnic
insane
nutballs
mania
non compos mentis
few cards shy of a full deck
WTFery
addle-brained
fond
lunatically
lunkheaded
off one's tree
out of one's gourd
out of one's tree
off one's box
out of one's box
screw loose
distraction
sick-ass
crackhead
anoia
dwaal
roof-brain chatter
mad
cloud nine
étourderie
chimera
batshitness
nitty
dull-witted
lunatical
fruitloop
dementia
delusional
headlong
meshugge
crack up
paralytic dementia
wowf
mooncalf
general paralysis of the insane
general paralysis
cockamamie
insaneness
hardened
mad as a hatter
mad as a mongoose
misregardful