unknown, undisclosed, mysterious, hidden, unreleased, undiscoverable, unsuspected, secret, unacknowledged, unexplored, unnamed, unknow, unplumbed, unexplained, unseen, intriguing, unmentioned, sketchy, undefined, concealed, uncovered, unexpressed, unknowable, undetermined, obscure, unspecified, unconfirmed, nameless, indeterminable, closemouthed, unrevealing, presumable, inscrutable, unhidden, unnamable, unmapped, unperceived, unstated, enigmatic, undiscovered, unforthcoming, privy, shrouded, unnameable, depthless, alchemic, unspecific, unidentifiable, unmasked, cryptic, unclarified, coy, dostoyevskian, incommunicable, amnesiac, tightlipped, sinister, unanalyzed, phrasal, cryptozoological, nonliterary, murkiest, unpublished, nebulous, expressible, ludic, fictive, exact, unresolved, illimitable, unrecorded, knowable, unexamined, unconsummated, chimerical, ambiguous, shadowy, cloaked, originary, unaware, unaired, unimagined, unmeasured, presumed, unnoted, tantalizing, aforementioned, supernatural, sophistical, untitled, untraceable, actual, adulterous, fleshed, nefariousness, unsuspicious, unassociated, profoundest, unapparent, anonymous, devious, cagey, revealed, recondite, comprehending, unfathomable, immanent, profounder, transcendent, unchangeable, unchanging, unsearchable, deeper, mundane, transcending, allencompassing

covert