Adjective personal, intimate
Synonyms: behind the scenes, clandestine, closet, close to one’s chest, confidential, discreet, exclusive, hushed, hush-hush, independent, individual, inside, nonpublic, not open, off the record, own, particular, privy, reserved, secret, separate, special, under one’s hat, unofficial
Antonyms: open, public, sociable
Adjective hidden, isolated
Synonyms: concealed, discreet, quiet, removed, retired, secluded, secret, separate, sequestered, solitary, withdrawn
Antonyms: open, revealed, unconcealed