KEY: Mysterious.
SYN: Dim, obscure, unrevealed, unexplained, unaccountable, reserved, veiled, hidden, secret, incomprehensible, mystic, inexplicable.
ANT: Clear, plain, obvious, explained, understood, easy, explainable, simple, frank, communicative.
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KEY: Mystery.
SYN: Enigma, puzzle, obscurity, secrecy, veil, shroud, arcanum.
ANT: Publication, solution, commonplace, truism, matter-of-fact.
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KEY: Mystic.
SYN: Mysterious, cabalistic, magical.