overconfident
🇺🇸
/ˌəʊvərˈkɑːnfɪdənt/
🇬🇧
/ˌəʊvəˈkɒnfɪdənt/
being too sure of oneself
She was overconfident about her ability to win the race, leading to her surprise loss.
她对赢得比赛的能力过于自信,导致了她的意外失利。