I am here to help you understand her, because, for some unfathomable reason, she cares about you.
The point of this board game remains unfathomable to me.
The college textbook seemed unfathomable to the middle school student.
Because his plan was unfathomable to his friends, no one would aid him in his efforts.
I find it unfathomable that Kimm won't accept the promotion, when she's worked so hard this year.
The God of the Christian faith is omnipotent and unfathomable.
Pat kept her facial expressions so reserved that her emotions were unfathomable.
Even after hours of thought, Olivia still couldn't solve the unfathomable riddle.