Definition of sententiously adverb from the Oxford Advanced Learner's Dictionary

 

sententiously

 adverb
adverb
BrE BrE//senˈtenʃəsli//
 
; NAmE NAmE//senˈtenʃəsli//
 
(formal, disapproving)
 
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in a way that tries to sound important or intelligent, especially by expressing moral judgements ‘It’s never easy to serve two masters,’ he said sententiously.