intimate
homely
à deux
privately
private
close-tiled
in petto
esoteric
in secret
privy
private message
privateness
under the rose
have a quiet word
have a word in someone's ear
tête-à-tête
head-to-head
tete-a-tete
personal life
nonprivate
personalness
keep one's own counsel
personalism
knowing
keep one's counsel
in confidence
eavesdropper
hoard
secret
heart-to-heart
inwardly
inside
tutor
coach
private instructor
ultrapersonal
personals
ownability
sanctum sanctorum
interiority
auricular
heart of hearts
proprietary
behind closed doors
self-sufficiency
autonomy
custom
eavesdropping
private means
self-direction