nicen up
nonlobar
nonutile
noninteresting
incongenial
unnoticeable
unapropos
inappropo
unplain
ungreat
unokay
nonsensible
unnoteworthy
nonlitigable
unregardable
numbskulled
uncomplaisant
simpleminded
dumbassed
lamish
retardical
thick
dog shit
unresplendent
dumbbutt
bull
cack
unfabulous
tut
dumb as an ox
one brick short of a full load
numbnut
dumbish
unsensuous
unmarvellous
entire
sillyish
nonsensuous
nonafferent
unawesome
undelightsome
unsmutty
unmarriable
unplaintive
miscegenistic
unaffixed
miscegenative
miscegenic
nuh-uh
ungenial