ignoramus

He's such an ignoramus when it comes to technology.

The new intern is a complete ignoramus in this field.

She was tired of dealing with ignoramuses who refused to listen.

The ignoramus confidently spouted off incorrect information.

Don't waste your time arguing with that ignoramus.

The ignoramus made a fool of himself in front of the whole team.

I can't believe he's such an ignoramus about basic geography.

The professor was shocked by the level of ignoramus displayed by the students.

She felt like an ignoramus in the advanced math class.

The ignoramus failed to grasp the concept despite multiple explanations.