"deepness" in the noun sense
1. astuteness, profundity, profoundness, depth, deepness
the intellectual ability to penetrate deeply into ideas
2. deepness, profundity, profoundness
the quality of being physically deep
"the profundity of the mine was almost a mile"
3. depth, deepness
the extent downward or backward or inward
"the depth of the water"
"depth of a shelf"
"depth of a closet"
a low pitch that is loud and voluminous
Source: WordNet® (An amazing lexical database of English)
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