Definition of self-important adjective from the Oxford Advanced Learner's Dictionary

 

self-important

 adjective
adjective
BrE
 
; NAmE
 
(disapproving)
 
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thinking that you are more important than other people synonym arrogant He was a self-important little man. She was not at all the self-important celebrity I’d read about.
See the Oxford Advanced American Dictionary entry: self-important