unfathomable
US /ʌnˈfæð.ə.mə.bəl/
UK /ʌnˈfæð.ə.mə.bəl/
1.
計り知れない, 理解しがたい, 深遠な
incapable of being fully explored or understood
:
•
The depths of the ocean are still largely unfathomable.
海の深さはまだほとんど計り知れない。
•
His decision to leave was unfathomable to his family.
彼の去るという決断は家族にとって理解しがたいものだった。