Over-Confidence?

o·ver·con·fi·dent/ˈoʊvərˈkɒnfɪdənt/[oh-ver-kon-fi-duhnt] – adjective
Meaning..........: too confident.
Synonyms........: cocksure, brash, arrogant, reckless, heedless.
Other meanings : Excessively confident; presumptuous;

.....................Total certainty than circumstances warrant

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Sound like the stock market, isn't it?