"The Dunning–Kruger effect is a cognitive bias manifesting in unskilled individuals suffering from illusory superiority, mistakenly rating their own ability much higher than is accurate. This bias is attributed to a metacognitive inability of the unskilled to recognize their ineptitude. Conversely, people with true ability tend to underestimate their relative competence."
Morris, Errol (20 June 2010). “The Anosognosic’s Dilemma: Something’s Wrong but You’ll Never Know What It Is (Part 1)”. New York Times. Retrieved 7 March 2011.