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Definition of sibylline adjective from the Oxford Advanced Learner's Dictionary

sibylline

adjective

/ˈsɪbɪlaɪn/

/ˈsɪbɪlaɪn/

(literary)

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mysterious and difficult to understand
Word Originlate 16th cent.: from Latin Sibillinus, from Sibylla sibyl.

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See sibylline in the Oxford Advanced American Dictionary

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