intensely
in camera
privately
in private
blah blah blah
eavesdropping
keep one's mouth shut
confidable
unspeakingly
sing small
button it
talkless
indoor voice
in hiding
heart-to-heart
doggo
tongue-tied
out of sight
hold one's peace
whisper
crickets
all mouth and trousers
listen in
keep mum
unspeaking
have a quiet word
ponce
auricular
have a word in someone's ear
keep one's lips sealed
in silence
keep quiet
open up
tell
taciturn
eavesdropper
shusher
rame
husher
close-tiled
incommunicado
find one's tongue
conversationless
bull session
taciturnly
hush-hush
chattiness
loose lip
dialogueless
man of few words
gibber
keep to oneself
unworriedly
evasive
silence
gibberish
break the ice
timidly
head-to-head
manspeak
Sam Spade
hushable
tete-a-tete
unhushed
a closed mouth catches no flies
er
collogue
between you and me
reclusive
save one's breath
have a word
unreticent
shoot one's mouth off
lonesomely
mutely
huddle room
chit-chat
tête-à-tête
claver
lip off
blabbermouthed
private message
tick a lock
quiet as a mouse
impenetrable
clam up
unstirringly
chitchat
chew the fat
end run
chaffer
solitarily
mum
in conclave
chatter
chat
secretly
in petto