American English

Definition of sibylline adjective from the Oxford Advanced American Dictionary

 

sibylline

 adjective
adjective
NAmE//ˈsɪbəˌlin//
 
, NAmE//ˈsɪbəˌlaɪn//
 
(literary)
 
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mysterious and difficult to understand
See the Oxford Advanced Learner's Dictionary entry: sibylline