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deepness (n.)

Old English deopnes "deep water," also "a mystery or secret;" see deep (adj.) + -ness. From late 12c. as "distance downward;" c. 1200 as "wisdom, profundity."

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Definitions of deepness from WordNet

deepness (n.)
the intellectual ability to penetrate deeply into ideas;
Synonyms: astuteness / profundity / profoundness / depth
deepness (n.)
the quality of being physically deep;
deepness (n.)
the extent downward or backward or inward;
Synonyms: depth
deepness (n.)
a low pitch that is loud and voluminous;
From wordnet.princeton.edu