overconfidence; overconfident person
General use for excessive self-assurance or someone who is overconfident. Can be used as a noun or adjectival noun.
Everyone is fed up with his overconfident attitude.
Let's be careful not to become overconfident.
false belief of enlightenment
Buddhist technical term: the delusion of believing one has attained enlightenment when one has not. Rare outside religious contexts.
Zōjōman is one of the forms of arrogance warned against in Buddhism.