과감하다 means "drastic, daring, decisive, bold" ex) 그 여배우는 과감하게 파인 옷을 즐겨 입는다 The actress enjoys wearing daring clothes. 그는 좀 더 과감해지기로 결심했다 He decided to take the bull by the horns. 당돌하다 - daring, plucky, (informal) spunky ex) 그는 매우 당돌하다 He is plucky. 그 아이는 질문에 당돌하게 대답했다 The child gave a spunky reply to the question. - rude, insolent ex) 그는 선생님에게 당돌하게 굴었다 He was insolent to the teacher. 어른 앞에서 그렇게 말하다니 참 당돌하다 It is very rude of you to talk like that to your elders. 과감하다 and 당돌하다 both can mean "daring" 과감하다 has a nuance of "bold" 당돌하다 has a nuance of "rude" You should use 당돌하다 to a person younger than you.

* 과감하다. drastic, daring, decisive, bold ex)과감한 결정을 내리다 make a bold decision *당돌하다. daring, plucky, (informal) spunky ex)그는 매우 당돌하다 He is a daring fellow.