당돌해요 · 당돌했어요 · 당돌한 (+noun)
bold, forward, cheeky (especially for a young person)
Example
어린 학생이 사장님에게 당돌하게 질문을 했어요.
A young student boldly asked the company president a question.
Word parts
당 abrupt+돌 sudden
Literally 'abrupt and sudden' — acting without the expected deference.
Good to know
Can be admiring or critical depending on tone: a 당돌한 신입 is a gutsy, unintimidated newcomer.