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Adjective: mysterious  mi'steer-ee-us
  1. Of an obscure nature
    "the new insurance policy is written without cryptic or mysterious terms"; "in its mysterious past it encompasses all the dim origins of life"; "the new insurance policy is written without cryptical or mysterious terms";
    - cryptic, cryptical, deep, inscrutable, mystifying
  2. Having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding
    "mysterious symbols";
    - mystic, mystical, occult, secret, orphic

See also: esoteric, incomprehensible, inexplicable

Encyclopedia: Mysterious