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



BrE BrE//ˈbʌmpʃəs//
; NAmE NAmE//ˈbʌmpʃəs//
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showing that you think that you are very important; often giving your opinions in a loud, confident and annoying way Word Originearly 19th cent.: humorously from bump, on the pattern of fractious.
See the Oxford Advanced American Dictionary entry: bumptious