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слабоумный n stresses
gen.	soft weak in the head; mouthbreather (иногда раздельно: mouth breather; иногда через дефис: mouth-breather: every single word that mouthbreather is allowed to publish is completely destroying the image of the newsletter vogeler); crazy; cretin; driveling; drivelling; lean witted; single witted; soft headed; spooney; feeble-minded person
derog.	dotard (MichaelBurov)
fig.of.sp.	intellectually weak (Sergei Aprelikov)
inf.	soft-headed (Andrey Truhachev); soft in the head (Andrey Truhachev); weak in the head (Andrey Truhachev)
law	unsound
слабоумный adj.
gen.	feeble-minded; anile; imbecile; weak-minded; halfwitted; doddering; moron; soft; witless; cousin Betty (человек); mentally deficient; batchy; half-wit; sackless; demented ("demented" implies a violence of behavior or attitude that's incongruent with слабоумный (or, used in a casual sense, it can also mean "out of one's mind": You're not going to do the assignment? Are you demented?) Liv Bliss); idiot; moronic; subnormal; cretinous; daft (о человеке); feeble minded; half wit; weak minded; deficient; Feebleminded (Pavel_Gr); feebleminded; silly (Lanita2); Cousin Betty; doting; slow-witted; foolish; slow witted; weak-headed
amer., inf.	retard; retardee
arch.	fatuous
austral., slang	loony; loopy
avia., med.	mentally defective
busin.	mentally handicapped; mentally retarded
inf.	daft; caky; numpty (andriy f); crack-brained; empty-headed (Andrey Truhachev); brainless (Andrey Truhachev); pea-brained (Andrey Truhachev); enfeebled (Olya34); gaga
jarg.	meat-head
law	person of weak mind
Makarov.	soft in the head; weak in the head
med.	defective; mentally defective; half-witted; irrational; ament; retarded (bolton926); punch-drunk (Andrey Truhachev); dement (I. Havkin)
notar.	lunatic
obs.	changeling; dotardly
psychol.	incomplete (upws)
slang	half-baked; balmy; gomer ("Stop acting like a gomer!" Franka_LV)
uncom.	doddery; fool
слабоумно adv.
gen.	crazily
obs.	unsoundly
слабоумные adj.
law	feebleminded people

слабоумный: 12 phrases in 6 subjects

Australian	1
Chess	1
General	7
Makarov	1
Obsolete / dated	1
Vernacular language	1