unfathomable
US /ʌnˈfæð.ə.mə.bəl/
UK /ʌnˈfæð.ə.mə.bəl/

1.
tak terduga, tak terpahami, tak terukur
incapable of being fully explored or understood
:
•
The depths of the ocean are still largely unfathomable.
Kedalaman samudra masih sebagian besar tak terduga.
•
His decision to leave was unfathomable to his family.
Keputusannya untuk pergi tidak dapat dipahami oleh keluarganya.