English

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

 

sibylline

 adjective
adjective
BrE BrE//ˈsɪbɪlaɪn//
 
; NAmE NAmE//ˈsɪbɪlaɪn//
 
(literary)
 
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mysterious and difficult to understand Word Origin late 16th cent.: from Latin Sibillinus, from Sibylla sibyl.
See the Oxford Advanced American Dictionary entry: sibylline