Ignoramus (noun)

A person who is ignorant or lacks knowledge or understanding in a particular field or subject, or a person who is unwilling to learn or acquire knowledge.

Origin:

Ignoramus comes from the latin word "ignoramus" which means "we do not know.".

Examples:

1. He is an ignoramus, he knows nothing about the topic we are discussing.
2. She was treated like an ignoramus by her colleagues, because she didn't have the proper knowledge.
3. I can"t believe you"re such an ignoramus, you didn"t know about that?
4. It"s frustrating to work with an ignoramus, who doesn"t want to learn or improve.
5. The ignoramus"s lack of knowledge is holding back the team"s progress.