overconfident
🇺🇸
/ˌəʊvərˈkɑːnfɪdənt/
🇬🇧
/ˌəʊvəˈkɒnfɪdənt/
adjective
R
being too sure of oneself
She was overconfident about her ability to win the race, leading to her surprise loss.
translation
being too sure of oneself