Learn English – A word to describe a person who makes a lot of mistakes but is unaware of it

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What do you call a person who always or gradually makes mistakes, but is unaware that they're making those mistakes? For example,

Nicolo and I are partners in a group project. The instructor asks a question about the project and Nicolo, nonchalantly, answers, not knowing he's leading our project's performance into failure. He's very confident he's doing the right thing, but he really isn't.

Is there any word that can describe this situation?

Best Answer

The person is suffering from 'Kruger-Dunning effect' which is a psychological phenomenon that someone who is incompetent overestimate their own capabilities.