The quality or state of being excessively confident or sure about something without good reason.
From 'cocksure' (adjective) plus the abstract noun suffix '-ness,' which converts adjectives into nouns describing abstract qualities. The 'cocksurel' root remains constant across word forms.
This noun captures that annoying feeling when someone won't admit they might be wrong—their cocksureness actually makes them less likely to learn from mistakes because they're too busy being certain!
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