資料來源 : pyDict

難測的,深不可測的,無底的

資料來源 : WordNet®

unfathomable
     adj 1: of depth; not capable of being sounded or measured [ant: {fathomable}]
     2: so deep as to be unmeasurable; "the abyssal depths of the
        ocean" [syn: {abysmal}, {abyssal}]
     3: impossible to come to understand