Etymology
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overconfidence (n.)

also over-confidence, "excessive confidence, state of being overconfident," 1700, from over- + confidence.

updated on October 24, 2019

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Definitions of overconfidence from WordNet

overconfidence (n.)
total certainty or greater certainty than circumstances warrant;
Synonyms: certitude / cocksureness
From wordnet.princeton.edu, not affiliated with etymonline.