1. excessively confident, arrogant, or presumptuous; overbearing in manner or attitude
Usage: often used to describe someone's pride, confidence, or claims that exceed what is justified

Examples

• His overweening pride prevented him from admitting his mistakes.
• The candidate's overweening confidence led to a shocking defeat.
• She dismissed the criticism with overweening disdain.
• The company's overweening ambition caused it to overextend financially.
• He had an overweening belief in his own abilities.
• Their overweening attitude alienated potential allies.
• The general's overweening strategy resulted in a military disaster.