#1 deepness n. [astuteness, profundity, profoundness, depth] the intellectual ability to penetrate deeply into ideas. wn
#2 deepness n. [profundity, profoundness] the quality of being physically deep; "the profundity of the mine was almost a mile". wn
#3 deepness n. [depth] the extent downward or backward or inward; "the depth of the water"; "depth of a shelf"; "depth of a closet". wn
#4 deepness n. a low pitch that is loud and voluminous. wn
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