unfathomable
US /ʌnˈfæð.ə.mə.bəl/
UK /ʌnˈfæð.ə.mə.bəl/
1.
insondable, incomprensible, inconcebible
incapable of being fully explored or understood
:
•
The depths of the ocean are still largely unfathomable.
Las profundidades del océano son todavía en gran parte insondables.
•
His decision to leave was unfathomable to his family.
Su decisión de irse fue incomprensible para su familia.