꼰대가 · 꼰대를 · 꼰대 같다
condescending know-it-all; preachy older person or boss (slang)
Example
우리 부장님은 좋은 분인데 가끔 꼰대 같아요.
My department head is a good person, but sometimes acts like a preachy know-it-all.
Word parts
Old slang for one's father or teacher; its origin is uncertain. Now it means anyone who lectures others and insists 'my way is right'.
Good to know
Casual and critical — never say it to someone's face. The joke phrase 라떼는 말이야 (a pun on 나 때는 말이야 'back in my day') mocks typical 꼰대 talk. Young people can be 꼰대 too (젊은 꼰대).