Definition of sibylline in English:

sibylline

Line breaks: sibyl|line
Pronunciation: /ˈsɪbɪlʌɪn
 
/

adjective

chiefly literary
Relating to or characteristic of a sibyl; prophetic and mysterious: one glimpses them, uttering sibylline predictions of weal and woe his fascinating, if sometimes sibylline, meditations on the nation
More example sentences
  • Mrs Atwater, in sibylline style, predicts of Philip: ‘These hands will bring you great fame.’
  • The girl's sibylline countenance unnerved viewers who, as one critic put it, were almost ‘repelled by the directness and force of the painting.’
  • It's confessional and ruminative, yet also clipped, ‘teacherly’ and sibylline.

Origin

late 16th century: from Latin Sibillinus, from Sibylla sibyl.

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Pronunciation: nēˈätn-ē
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retention of juvenile features in the adult animal