夜郎自大 (yè láng zì dà): To be arrogantly ignorant — Meaning & Stroke Order

That official was arrogantly ignorant, refused to learn advanced technology, and was eventually phased out.

People who are arrogantly ignorant often fail to see their own shortcomings.

If you don't understand the outside world, it's easy to be arrogantly ignorant.

His arrogant and ignorant attitude made his colleagues all dislike him.