secret

I adjective abstruse, acroamatic, acroamatical, arcane, arcanus, clandestine, close, concealed, confidential, covert, cryptic, dark, esoteric, furtive, hidden, latent, mysterious, not public, obscure, occult, occultus, private, privy, recondite, secluded, secretus, shrouded, sly, surreptitious, undisclosed, undivulged, unknown, unpublished, unrevealed, unseen, untold, veiled associated concepts: secret lien, undisclosed principal II noun abstruse knowledge, arcana, cabal, classified information, concealed knowledge, confidence, confidential communication, confidential matter, enigma, hidden knowledge, inside information, intimacy, intrigue, mystery, obscure information, personal matter, private affair, private communication, private matter, privileged communication, privileged information, puzzle, recondite knowledge, res arcana, res occulta, unknown information, veiled information III index anonymous, clandestine, confidence (relation of trust), confidential, covert, enigma, enigmatic, esoteric, furtive, hidden, inscrutable, interior, intimate, mysterious, mystery, personal (private), private (confidential), privy, recondite, seal (close), sequester (seclude), sly, stealthy, surreptitious, ulterior, uncanny, undisclosed