"privatest" in the adjective sense
1. private
confined to particular persons or groups or providing privacy
"a private place"
"private discussions"
"private lessons"
"a private club"
"a private secretary"
"private property"
"the former President is now a private citizen"
"public figures struggle to maintain a private life"
2. private, intimate
concerning things deeply private and personal
"intimate correspondence"
"private family matters"
3. individual, private
concerning one person exclusively
"we all have individual cars"
"each room has a private bath"
4. secret, private
not expressed
"secret (or private) thoughts"
Source: WordNet® (An amazing lexical database of English)
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