Meaning of the word overconfidence in English

What does overconfidence mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

overconfidence

US /ˌoʊ.vɚˈkɑːn.fə.dəns/
UK /ˌəʊ.vəˈkɒn.fɪ.dəns/

Noun

the quality of being too confident; excessive confidence

Example:
His overconfidence led to several mistakes in the project.
Beware of overconfidence when making important decisions.