unplumbed
adj. 深度未用铅锤测量过的；未经探测的；未加探究的
近义词：unsounded，mysterious，unfathomable，enigmatic，unexplored，unknowable，incomprehensible，unfathomed，profound，
英英释义
Adjective
- situated at or extending to great depth; too deep to have been sounded or plumbed;
"the profound depths of the sea" "the dark unfathomed caves of ocean" "unplumbed depths of the sea" "remote and unsounded caverns"