quiet
silence
strike dumb
quieten
hush
fall silent
whist
wheesh
hushing
quieting
clam up
mute
shush
hush one's mouth
cork it
hushingly
hushen
overquietness
shut one's gob
play dumb
shut one's trap
shut one's face
shut one's mouth
silentious
ultrasilent
save one's breath
quate
hush up
hush down
put a sock in it
stilled
overquiet
diam
zip one's lip
quiescence
quiescency
quiesce
dormancy
shh
pipe down
still
hushedness
open one's big mouth
shushy
quietus
one could hear a pin drop
voices off
freeze
quieter
muten
husher
quietlike
aloud
silent
hypophonia
undertone
hushfully
fashy
quietish
dumbly
memory-hole
shushing
go in one ear and out the other
put a lid on it
nonspeak
shut up
hold one's peace
tuneless
keep a low profile
stillness
soft
sleepy
blank out
dumbfound
hushy
sing small
mutedly
blank
tumbleweed
yush
outsilence