Akademik

mysterious
I adjective abstruse, arcane, arcanus, baffling, cabalistic, clandestine, cloaked, coded, concealed, covert, cryptic, dark, disguised, enigmatic, enigmatical, esoteric, furtive, hidden, impenetrable, incomprehensible, ineffable, inexplicable, inscrutable, magical, masked, mystic, mystical, mystifying, obscure, occult, occultus, oracular, perplexing, preternatural, privy, puzzling, recondite, runic, screened, secret, secretive, secretus, shadowy, sphinxian, sphinxlike, stealthy, strange, supernatural, supernormal, surreptitious, transcendental, umbrageous, unaccountable, uncanny, undeciphered, undercover, underhand, undisclosed, unexplainable, unexplained, unfathomable, unintelligible, unknown, unrevealed, untold, veiled, weird II index covert, elusive, enigmatic, esoteric, evasive, furtive, hidden, inapprehensible, incomprehensible, indefinable, indefinite, indistinct, ineffable, inexplicable, inscrutable, obscure (abstruse), oracular, peculiar (curious), private (confidential), privy, problematic, recondite, secret, surreptitious, uncanny, uncertain (ambiguous), undisclosed, vague

Burton's Legal Thesaurus. . 2006