deepness

(noun) the intellectual ability to penetrate deeply into ideas. Synonyms: astuteness, profundity, profoundness, depth.

(noun) the quality of being physically deep. Synonyms: profundity, profoundness. Example: "The profundity of the mine was almost a mile."

(noun) the extent downward or backward or inward. Synonyms: depth. Examples: "The depth of the water." "Depth of a shelf." "Depth of a closet."

(noun) a low pitch that is loud and voluminous.