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

 

sententious

 adjective
adjective
BrE BrE//senˈtenʃəs//
 
; NAmE NAmE//senˈtenʃəs//
 
(formal, disapproving)
 
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trying to sound important or intelligent, especially by expressing moral judgements sententious remarks Word Origin late Middle English: from Latin sententiosus, from sententia ‘opinion’, from sentire ‘feel, be of the opinion’. The original sense was ‘full of meaning or wisdom’, later becoming depreciatory.
See the Oxford Advanced American Dictionary entry: sententious