Meaning

noun the intellectual ability to penetrate deeply into ideas

noun the quality of being physically deep

noun the extent downward or backward or inward

originFrom Middle English depnesse, from Old English dēopnes (“deepness; depth; an abyss”), from Proto-West Germanic *deupnassī, equivalent to deep + -ness. Cognate with German Low German Deepnis (“deepness, depth”).

Etymology from Wiktionary, CC BY-SA 3.0