1. having too much confidence in one’s abilities or chances of success

Examples

• The overconfident student didn’t study for the exam and failed.
• His overconfident attitude cost him the job interview.
• She was overconfident about winning the race and didn’t train hard enough.
• The team became overconfident after their early victories.
• Don’t be overconfident about the weather forecast.
• The overconfident driver took unnecessary risks on the highway.