impenetrable

US /ɪmˈpen.ə.trə.bəl/
UK /ɪmˈpen.ə.trə.bəl/
"impenetrable" picture
1.

堅不可摧的, 無法穿透的

impossible to pass through or enter

:
The fortress had an impenetrable defense system.
這座堡壘有一個堅不可摧的防禦系統。
The dense jungle was almost impenetrable.
茂密的叢林幾乎無法穿透
2.

難以理解的, 費解的

impossible to understand; incomprehensible

:
His handwriting was almost impenetrable.
他的筆跡幾乎難以辨認
The philosopher's theories were often impenetrable to the average person.
這位哲學家的理論對於普通人來說常常是難以理解的