overconfidence
noun
Meaning
Excessive belief in one's own abilities or judgment, often leading to a disregard for potential risks.
Examples
- His overconfidence in the stock market led him to invest his entire life savings in a single volatile tech company.
- The team's overconfidence after winning the first three games caused them to underestimate their opponent in the final match.
Synonyms: arrogance, hubris, conceit, presumption