"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"

4. deepness

a low pitch that is loud and voluminous

Source: WordNet® (An amazing lexical database of English)

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