empty
foolish
incommunicative
meaningless
nonmeaningful
uncommunicative
airy
asinine
awkward
bare
barren
bland
blank
blankminded
bleached
callow
calm
catchpenny
characterless
clear
devoid
dumb
empty-headed
empty-minded
empty-pated
empty-skulled
existless
fatuous
featureless
flimsy
fribble
fribbling
frivolous
frothy
futile
gauche
green
groping
hollow
idle
ignorant
inane
incogitant
inexperienced
innocent
insipid
jejune
know-nothing
lacking
light
minus
missing
bemused
carefree
colloquial
crestfallen
derogatory
disapprove
disdainful
emotionless
forgettable
guileless
impish
innocuous
jocular
raffish
rueful
sheepish
trite
uneventful
uninterested
unreadable
vacant