Overconfident people may ignore advice thinking they know best, but this can lead to mistakes. Ignoring the directions, he overconfidently assembled the furniture wrong.
Pro Tip 2/3
Risks Involved
Being overconfident might cause someone to take unnecessary or uncalculated risks. She overconfidently invested all her savings in one stock.
Pro Tip 3/3
Humility vs. Arrogance
Overconfidence is often seen negatively, as arrogance or a lack of humility. Overconfidently claiming he'd win easily, he was embarrassed when he lost.