unbalanced
off the deep end
misreason
raving
mad as a hatter
raving mad
crazy as a pet coon
mad as a mongoose
wild
batshit
out of one's box
off one's box
out of one's gourd
off one's tree
out of one's tree
off-minded
fictive
fucked in the head
craphead
tenebrose
inanely
unreasoned
irrationalistic
fatuously
wackadoodle
nonmentalistic
hypermentalizing
misshapen
knob-end
lose one's wits
irrationality
irrationally
pseudointellectual
irrationalist
fucktarded
fleabrain
unreason
have a screw loose
wowf
irreverence
asshead
unmoored
few cards shy of a full deck
sick-ass
delusiveness
sophistical
nitwit
deploredness
irrationalness
delusively