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cryptic
['krɪptɪk]
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cryptical
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deep
['dip]
a deep dark secret
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inscrutable
[ˌɪ'nskrutəbəɫ]
the inscrutable workings of Providence
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mysterious
[mɪ'stɪriəs]
"in its mysterious past it encompasses all the dim origins of life" - Rachel Carson
the new insurance policy is written without cryptic or mysterious terms
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mystifying
['mɪstəˌfaɪɪŋ]
rituals totally mystifying to visitors from other lands