hidden

hidden adjective  abstruse, ambushed, blind, buried, camouflaged, clandestine, cloaked, close, clouded, concealed, covered, covert, cryptic, dark, disguised, enigmatical, enshrouded, esoteric, hieroglyphic, indiscernable, invisible, latent, lurking, masked, mysterious, mystic, mystical, obscure, obscured, occult, occultus, out of sight, out of view, perdu, puzzling, recondite, screened, secluded, secret, secreted, shrouded, suppressed, surreptitious, unapparent, uncomprehended, undeciphered, undercover, underground, underhanded, undetected, undivulged, unexplained, unexposed, unknown, unperceived, unrevealed, unseen, untold, veiled
Associated concepts: attractive nuisance, duty to discover, hidden assets, hidden danger, hidden defects, hidden traps, latent defects, patent defects

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See also: abstruse, blind, clandestine, concealed, confidential, covert, enigmatic, esoteric, furtive, impalpable, inapprehensible, incomprehensible, inconspicuous, indirect, indiscernible, inexplicable, inscrutable, lost, mysterious, obscure, personal, private, privy, recondite, remote, secret, sly, stealthy, surreptitious, ulterior, undisclosed