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portentous

adjective
 
 
/pɔːˈten.təs/ US  /pɔːrˈten.t̬əs/

Definition

formal disapproving too serious and trying to be very important: The problem with the book is that it sometimes descends into portentous philosophizing.Showing arrogance and conceitConfidence and self-assuranceBoasting literary Portentous events, statements, or signs are important because they show that something unpleasant is very likely to happen: The report contains numerous portentous references to a future environmental calamity.Predicting things and intuition portentously
 
 
/-li/ adverb formal disapproving
(Definition of portentous adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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