This is the 8728th most frequent Korean word.
간단치
"간단치" means "not simple" or "not easy" in English.
간단치 않은 describes the complexity of the problem.
이 문제는 간단치 않은 것 같아요.
This problem doesn't seem simple.
간단치 않게 illustrates the manner in which the task was concluded.
그 일은 간단치 않게 끝났습니다.
The task concluded in a not-so-simple way.
간단치 않게 emphasizes the non-simplicity of finding the solution.