From Longman Dictionary of Contemporary Englishbumptiousbump‧tious /ˈbʌmpʃəs/ adjective PROUDtoo proud of your abilities in a way that annoys other people SYN arrogant —bumptiously adverb —bumptiousness noun [uncountable]
Examples from the Corpus
bumptious• She had been out with a young lawyer once, a bumptious and ambitious man, and a boring one.• She was clearly embarrassed at times by Durkin's bumptious behaviour.• Or bummed out, or bumped off, or some bumptious buckaroo had burst your bubble. 