acephalous
beheaded
decapitated
stupid
unintelligent
brainless
crownless
foolish
ignorant
inept
insensate
irrational
lackbrained
lean-minded
lean-witted
mindless
not bright
obstinate
of little brain
pea-brained
pin-brained
rash
reasonless
senseless
slackminded
slackwitted
topless
ungifted
unintellectual
unreasoning
untalented
unthinking
unwise
witless
armored
avenge
boneless
eyeless
faceless
furry
grisly
hairless
horned
hulking
humanoid
inanimate
legless
life-size
misshapen
oncoming
prostrate
recumbent
scaly
skinny
two-headed
ungainly
wingless