This is the 7495th most frequent Korean word.
치열하게
Fiercely; intensely; vigorously.
The word "치열하게" is used as an adverb to describe the intensity and dedicated effort put into the study.
그는 치열하게 공부하여 시험에서 높은 점수를 받았다.
He studied intensely and achieved a high score on the exam.
Here, "치열하게" modifies "경쟁하는" (competing) to emphasize the aggressive and intense nature of the competition.
치열하게 경쟁하는 시장에서 성공하기란 쉽지 않다.
It is not easy to succeed in a fiercely competitive market.
"치열하게" describes the vigorous and heated manner in which the argument took place.