abstract abstruse arcane arcanum beclouded behind the curtain behind the scenes blind buried by stealth cabala cabalistic camouflaged censored clandestine classified classified information close closed closemouthed clouded concealed confidence confidential confidential communication confidentially covered covert cryptic cryptographic dark deep deep-seated devious discreet disguised eclipsed encrypted enigma enigmatic esoteric esoterica evasive furtive furtively genitals guarded secret heavy hermetic hermetics hid hidden hole-and-corner hugger-mugger hush-hush immanent imperceptible implanted implicit in a cloud in a fog in eclipse in purdah in secret in the wings inalienable incommunicado incomprehensible indiscernible indwelling infixed ingrained inherent inner insensible internal intrinsic invisible inward inwrought irreducible latent lonesome mysterious mystery mystery of mysteries mystical obfuscated obscure obscured occult on the sly out of sight out-of-the-way parts personal matter private private matter private parts privately privates privileged communication privity privy privy parts profound profound secret pudenda quiet quietly recondite remote removed resident restricted restricted information retired screened sealed book secluded secluse secretive secretly sequestered shifty shrouded sightless smothered sneak stealthily stealthy stifled subjective submerged suppressed surreptitious surreptitiously the occult top secret top-secret transcendental ulterior unacknowledged unalienable unapparent unbeheld unbeholdable unbreatheable unchallengeable uncommunicative undeclared under an eclipse under cover under house arrest under security under wraps under-the-table undercover underground underhand underhanded underneath undiscernible undisclosable undisclosed undivulgable undivulged unknown unnoticed unobserved unperceivable unperceived unpublishable unpublished unquestionable unrealized unrevealable unrevealed unseeable unseen unspoken untellable untold unutterable unuttered unviewed unwhisperable unwitnessed viewless wrapped in clouds