This is the 13871st most frequent Korean word.
만만치
"만만치" means "not easy" or "difficult/challenging."
'만만치' is used here as part of the phrase '만만치 않아' to describe something that is not simple or easy.
그 일은 만만치 않아 보여요.
That task doesn't seem easy.
'만만치' indicates something considerable or significant.
그의 능력은 만만치 않음을 모두 인정했어요.
Everyone acknowledged that his ability is quite substantial.
'만만치' emphasizes the challenge or difficulty of something.