overconfidence

From over- + confidence.

• (US, Canada) IPA^(key): /oʊvɚˈkɑnfɪdənts/, /ovɚ-/, /-dɪnts/

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overconfidence (usually uncountable, plural overconfidences)

1. An excessive or unwarranted degree of confidence.
   • 1890 February, A[rthur] Conan Doyle, “Sherlock Holmes Gives a Demonstration”, in The Sign of Four (Standard Library), London: Spencer Blackett […], →OCLC, page 89:

     My case is, as I have told you, almost complete; but we must not err on the side of over-confidence.

   • 2011 February 5, Chris Whyatt, “Wolverhampton 2 - 1 Man Utd”, in BBC‎^[1]:

     Yet United may have paid the price for overconfidence as they completely lost their concentration after 10 minutes to let Wolves back in.

• overconfident