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не в своём уме stresses
gen.	barmy on the crumpet; not all there; not in one's right mind (Lev Frenklakh); not at all there; fifish; far-gone; out of one's mind; up the pole; off one's conk; as as mad as a March hare; as mad as a hatter; a screw loose; off out of, one's head; as crazy as a loon (Anglophile); as mad as a hatter; off one's rocker; a little bit off the top
Игорь Миг	one card short of a full deck; whack job
amer.	crazy as a bed-bug (Taras)
amer., Makarov.	out in left field
idiom.	not playing with a full deck (Wakeful dormouse); one sandwich short of a picnic (Wakeful dormouse); one sandwich shy of a picnic (Wakeful dormouse); one brick short of a full load (Wakeful dormouse); one brick shy of a full load (Wakeful dormouse); one card shy of a full deсk (Wakeful dormouse); a few sandwiches short of a picnic (Wakeful dormouse); a few cards short of a deck (Wakeful dormouse); two bricks shy of a load (Wakeful dormouse); a few bricks shy of a load (Wakeful dormouse)
inf.	around the bend (Британский англ. Баян); gaga; fruity; cracky; not right in the head; not of sound mind (Val_Ships); cuckoo; screw loose (Yeldar Azanbayev); a bit off (сокращённая форма выражения a bit off one's head Bobrovska); batty; dotty
invect.	off one's nut (igisheva)
jarg.	crazy in the head (igisheva)
Makarov.	as mad as a March hare; out of one's head; off one's head
nonstand.	off the rails (igisheva)
proverb	mad as a buck
slang	starkers; shot to bits (someone who is mentally "not all there" Ballistic); screwy
быть не в своём уме
gen.	to be off one's base

не в своём уме: 56 phrases in 8 subjects

American usage, not spelling	1
Dialectal	1
General	21
Idiomatic	2
Informal	11
Makarov	17
Proverb	2
Slang	1