Translation of "‎몰래" in English

‎새끼 물개들도 몹시 경계하므로 ‎몰래 접근하기는 어렵습니다

and the pups on high alert, it's hard to sneak in unnoticed.

당에 몰래 들어온 부르주아를 찾아내 제거하라는 명령이었죠

A call to hunt down and eliminate the “bourgeoisie who [had] sneaked into the party.”

‎일단 밤이 되면 ‎물개가 몰래 빠져나갈 확률이 ‎높아지겠죠

Once night falls, the seals should have a better chance of sneaking past.