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

portentous

adjective
pɔːˈtentəs
 
; pɔːrˈtentəs
 
 
1 (literary) important as a sign or a warning of something that is going to happen in the future, especially when it is something unpleasanta portentous sign2 (formal, disapproving) very serious and intended to impress people
Synonym
pompous
a portentous remark
portentously
pɔːˈtentəsli
 
; pɔːrˈtentəsli
 
adverbShe frowned portentously to add weight to her suggestion.
portentousness
pɔːˈtentəsnəs
 
; pɔːrˈtentəsnəs
 
noun [uncountable]
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