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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Merriam-Webster unabridged
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Time Traveler for overconfident
The first known use of overconfident was circa 1617
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