stewpot
slow
tenebrose
brainless
lowbrow
lackluster
ungenius
subintellectual
gormless
simplicity
unknowledgeable
nonvisionary
lackbrain
simple-mindedly
acataleptic
half-brained
Orphic
not the sharpest tool in the box
silly
simpleminded
underimagined
not the sharpest tool in the shed
nonassociable
unassociable
vacancy
not the sharpest knife in the drawer
folly
inconcinnity
insensibility
nonexemplification
nonsavvy
submoron
legend in one's own lunchtime
uncontriving
light-witted
nongenius
short-witted
nonelitist
subexpert
drool bucket
dull
mindblindness
noncharismatic
uncharismatic
dysrationalia
batchy
talk fast and loose
naive
shallow
cerebrally challenged
provincialism
unomniscient
nonomniscient
stupid
intellectually challenged
alogically
adespotic
unbright
nonunivocity
nondiscernment
indiscernible
opacity
incogitative
mindlessness
unhomogeneity
inerudite
unenlightened
vagueness
nonphilosopher
talk through one's hat
simpleton
underwitted
darkness
inaccordant
dissociable
noncomprehender
mystic
half-witted
unintellectual
inarticulable
occult
nontheorist
conceitlessness
unworldly
abhorrent
secret
forgettery
mysterious
nondescribable
orphic
mystical
nondiligence
unintelligent
incoherence
unintelligence
avidya
nonintelligent
dull-minded