halfwit
nonintelligent
blockish
inadequacy
unintelligent
nondescript
parviscient
naive
dullness
foresightless
cloistered
unforesighted
unforesightful
not the sharpest tool in the box
not the sharpest knife in the drawer
not the sharpest tool in the shed
short
unmindful
noncomprehension
dissociable
shortsighted
noncharismatic
myopic
uncharismatic
unsophisticated
oblivious
unsmart
half-witted
vacuous
ill-informed
unerudite
mindless
nonrecognition
vacant
incogitative
unintrigued
incognizance
insociable
unforethoughtful
inexpertness
inerudite
unintelligence
unastute
famelessness
four oh four
unimpressible
rude