impenetrably

adverb
1
in a way that is impossible to understand
غیرقابل‌درک, به طور غیرقابل فهم
synonym incomprehensibly
2
in a way that cannot be entered, passed through or seen through
به طور نفوذناپذیر, به شکلی که قابل عبور نباشد, بطور نفوذناپذیر, بطور غیرقابل عبور
The passage was impenetrably dark.