inarticulate
unarticulate
anaudic
aphasic
aphonic
breathless
brief
brusque
close
close-lipped
close-tongued
closemouthed
concise
curt
dumb
dumbfounded
dumbstricken
dumbstruck
economical of words
implicit
implied
indisposed to talk
inferred
laconic
mum
mute
quiet
reserved
reticent
short
silent
snug
sparing of words
speechless
stricken dumb
tacit
taciturn
terse
tight-lipped
tongue-tied
tongueless
uncommunicative
undeclared
understood
unexpressed
unloquacious
unmentioned
unproclaimed
unpronounced
anguished
audible
frenzied
hoarse
incoherent
incredulous
inward
long-drawn
plaintive
raucous
soundless
tearful
throaty
unspoken
voiceless