1. in a self-assertive or arrogantly aggressive manner; with obnoxious self-importance
Usage: adverb form of bumptious; describes behavior that is offensively bold or pushy

Examples

• He bumptiously interrupted the meeting to promote his own ideas.
• She bumptiously claimed credit for work she barely contributed to.
• The new employee bumptiously corrected his supervisor in front of the entire team.
• He spoke bumptiously about his accomplishments, alienating his colleagues.
• The candidate bumptiously dismissed all opposing viewpoints during the debate.
• She bumptiously pushed her way to the front of the line without asking.
• He bumptiously asserted his authority despite having no official rank.