overconfidence
noun
over·con·fi·dence
| \ ˌō-vər-ˈkän-fə-dən(t)s
, -ˌden(t)s\
, -ˌden(t)s\
Definition of overconfidence
: an excess of confidence (as in one's abilities or judgment) : confidence that is not justified
warned against overconfidence when investing People tend to overestimate their skills behind the wheel and underestimate the skills of the boobs and psychopaths driving around them, a phenomenon that psychologists call "optimism bias" and the rest of us simply call delusional overconfidence.— David H. Freedman
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