unfathomable

US /ʌnˈfæð.ə.mə.bəl/
UK /ʌnˈfæð.ə.mə.bəl/
"unfathomable" picture
1.

深不可測的, 難以理解的, 不可思議的

incapable of being fully explored or understood

:
The depths of the ocean are still largely unfathomable.
海洋的深度在很大程度上仍然是深不可測的
His decision to leave was unfathomable to his family.
他離開的決定對他的家人來說是不可思議的