Definition of imperious adjective from the Oxford Advanced American Dictionary

 

imperious

 adjective
adjective
NAmE//ɪmˈpɪriəs//
 
(formal)
 
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expecting people to obey you and treating them as if they are not as important as you The professor was as imperious as ever. She put out an imperious hand to stop him. an imperious gesture/voice/command
imperiously
 
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adverb “Get it now,” she demanded imperiously.
See the Oxford Advanced Learner's Dictionary entry: imperious