extramental
extrapsychic
subintellectual
nonintellectual
cacophrenic
extraphilosophical
simple-mindedly
myopia
superintellectual
unbright
antipsychology
imaginationless
simplicity
vacancy
beyond one's ken
lackluster
noetic
short-witted
room-temperature IQ
submoron
mindless
vacant
vacuous
shallow
acognitive
not the sharpest knife in the drawer
philistine
out of the box
anti-intellectual
not the sharpest tool in the box
not the sharpest tool in the shed
underimagined
lowbrow
out of one's cotton-picking mind
ultracrepidate
extranoematic
unlearned
unlettered
fool
ignorant
nescient
simple
unknowledgeable
nonmental
unskillfulness
absence
dull
simpleton
naive
subexpert
naïveté
stunod
light-witted
half-brained
subnormal
moony
naivistic
preintellectual
unconventional
gormless
in one's head
shallowpate
underambition
cerebrally challenged
away
intellectually challenged
slow
cloistered
off the track
aside
whifty
brute
four oh four
intellectually
extraneurological
noncognition
underwitted
rube
unintellectualized
absentness
feeblemindedness
aristophrenic
fatuity
half-witted
mentally challenged
anticonceptualist
one-dimensional
nethermind
dull-witted
metarealistic
automaticity
submoronic
mental
aphilosophical
egghead
nonthinker
weak