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sibylline

[ sib-uh-leen, -lahyn, -lin ]
/ ˈsɪb əˌlin, -ˌlaɪn, -lɪn /
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adjective

of, resembling, or characteristic of a sibyl; prophetic; oracular.
mysterious; cryptic.

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The rainy weather could not ________ my elated spirits on my graduation day.
Also si·byl·ic, si·byl·lic [si-bil-ik]. /sɪˈbɪl ɪk/.

Origin of sibylline

First recorded in 1570–80; from Latin Sibyllīnus “pertaining to a sibyl”; see origin at sibyl, -ine1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
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