adj.过分自信的，自负的

He's overconfident in his abilities, which often leads to careless mistakes.
他对自己的能力过于自信，这常常导致粗心大意的错误。
She was overconfident about her chances of winning the competition.
她对自己的比赛获胜过于自信。
The new CEO's overconfidence has employees worried about the company's future.
新任CEO的过度自信让员工对公司的未来感到担忧。
Don't be overconfident, there's still a lot to learn from your seniors.
别太自信，你还有很多东西需要向老员工学习。
His overconfidence in the market analysis led to a disastrous investment decision.
他在市场分析上的过度自信导致了灾难性的投资决定。
The football coach's overconfidence in his team's defense proved costly in the match.
足球教练对球队防守的过度自信在比赛中付出代价。
Overconfidence can be a major obstacle to achieving humility and self-improvement.
过度自信可能成为实现谦逊和自我提升的一大障碍。
After winning a few games, he became overconfident and started to take risks on the field.
赢了几场比赛后，他变得过于自信，开始在场上冒险。
Her overconfident attitude towards the project made others question her leadership skills.
她在项目上的过度自信让人质疑她的领导能力。
The startup founders' overconfidence in their product's success blinded them to potential risks.
初创公司的创始人对产品成功的过度自信让他们忽视了潜在的风险。