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sibylline

[sib-uh-leen, -lahyn, -lin]
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adjective
  1. of, resembling, or characteristic of a sibyl; prophetic; oracular.
  2. mysterious; cryptic.
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Also si·byl·ic, si·byl·lic [si-bil-ik] /sɪˈbɪl ɪk/.

Origin of sibylline

First recorded in 1570–80, sibylline is from the Latin word Sibyllīnus pertaining to a sibyl. See sibyl, -ine1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for sibyllic

sibylline

adj.

1570s, from Latin sibyllinus, from sibylla (see sibyl).

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Online Etymology Dictionary, © 2010 Douglas Harper