hidden

modif.

1. Secret

   esoteric, clandestine, surreptitious; see secret 3, obscure 3, unknown 1.

2. Concealed from view

   secreted, secluded, out of sight, private, covert, concealed, undercover, occult, arcane, in the dark, in a haze, in a fog, in darkness, masked, screened, veiled, cloaked, obscured, disguised, socked in, invisible, clouded, sealed, unobserved, blotted, in eclipse, impenetrable, unseen, eclipsed, unexposed, camouflaged, enshrouded, undetected, shrouded, shadowy, unknown, indiscernible, latent, buried, opaque, deep, unsuspected, inscrutable, unapparent, inexplicable, illegible, unintelligible, imperceptible, puzzling, unobserved, out of view, dim, recondite, overlaid, clandestine, subterranean, cloistered, suppressed, secured, hermetic, dark, inward, underground, unrevealed, undisclosed, imperceivable, inert, withheld, surreptitious, sequestered, underhand, unsearchable, kept in the dark*, under wraps*, kept dark*; see also covered 1, isolated, obscure 1, withdrawn.

   Antonyms obvious*, open*, apparent. *

3. Mysterious

   symbolical, abstruse, cryptic; see magic 1, mysterious 2, secret 1.