Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
bumptious is an adjective meaning "offensively self-assertive". It carries one recorded sense.
offensively self-assertive
Definitions, synonyms and semantic relations for bumptious come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.