fathomless
adjective literary uk/ˈfæð.əm.ləs/ us/ˈfæð.əm.ləs/
(DEEP)
深不可测的
too deep to be measured
a fathomless ocean 深不可测的海洋
figurative She gazed into the fathomless depths of his brown eyes. 她凝视着他那双深邃的棕色眼睛。
(MYSTERIOUS)
无法理解的
impossible to understand
It's a fathomless mystery. 这是个不解之谜。