Know-it-all (noun/adjective)

As a noun, refers to a person who acts as if they know everything and is unwilling to learn or listen to others. As an adjective, refers to a characteristic or attitude of such a person.

Origin:

From the phrase know it all, which is a person who claims to know everything and is unwilling to learn or listen to others.

Examples:

1. He was a know-it-all and never wanted to admit when he was wrong.
2. She was tired of working with a know-it-all who never listened to anyone else's ideas.
3. He was a know-it-all who thought he was always right.
4. The know-it-all attitude made it hard for her to work with him.
5. He was a know-it-all and had an answer for everything, but it was not always a good one.