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Crudely or loudly assertive; pushy.

[Perhaps blend of bump and presumptuous.]

bump′tious·ly adv.
bump′tious·ness n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adv.1.bumptiously - in a bumptious manner; "he behaved rather bumptiously and offended the hostess"
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References in periodicals archive ?
Naturally, Filipinos are sensitive about foreigners coming in and sometimes bumptiously pushing folks around.
On the eve of an important visit by United States President Barack Obama to the Gulf region last month, where he met with Arab Gulf leaders, the flagship magazine of the US foreign policy establishment, Foreign Affairs , published an article bumptiously titled 'The United States Has No Gulf Allies'.