over·​con·​fi·​dent | \ˌō-vər-ˈkän-fə-dənt, -ˌdent\

Definition of overconfident 

: excessively or unjustifiably confident : having too much confidence (as in one's abilities or judgment) an overconfident driver wasn't overconfident about their chances of winning … he often starts cold, missing a few shots, allowing his opponent to get on a roll, to get overconfident.— Brett Forrest

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Other Words from overconfident

overconfidently adverb
overconfidently predicted the team would win

First Known Use of overconfident

circa 1617, in the meaning defined above

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Time Traveler for overconfident

The first known use of overconfident was circa 1617

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More from Merriam-Webster on overconfident

Thesaurus: All synonyms and antonyms for overconfident

Spanish Central: Translation of overconfident

Nglish: Translation of overconfident for Spanish Speakers

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