adjective. 1Unfathomably deep. 'There was such longing and loneliness buried deep within those depthless eyes as there had never been before.

What is meant by Depthlessness?

(ˈdɛpθlɪs) adj. 1. literary immeasurably deep; fathomless.

What do you call deep sea?

The deep sea or deep layer is the lowest layer in the ocean, existing below the thermocline and above the seabed, at a depth of 1000 fathoms (1800 m) or more. ... In 1960, the Bathyscaphe Trieste descended to the bottom of the Mariana Trench near Guam, at 10,911 m (35,797 ft; 6.780 mi), the deepest known spot in any ocean.