inarticulable
onology
uncleverly
negation
non-pedantic
stem-winder
unspeakingness
illiterally
hammer-headed
unpedantic
thickwitted
unutterable
insudative
baragouin
underspeak
mumble
nontalkative
mother tongue
noneducable
haver
weak-minded
nonspeech
drop a brick
unclever
swallow one's words
talk fast and loose
inarticulate
a dumb priest never got a parish
unarticulate
intellectually challenged
acatamathesia
dumbishly
hypoarticulation
unassertable
cerebrally challenged
toneless
titubancy
nonsociable
unastute
nonsubstantive
unessayed
dumbfoundingly
unadjectived
unintellectual
drivel
unteacherly
autistic
tongue-tied