1.  deepness(n = noun.cognition) astuteness, depth, profoundness, profundity - the intellectual ability to penetrate deeply into ideas;
is a kind of sapience, wisdom
Derived form adjective deep₂

2.  deepness(n = noun.attribute) profoundness, profundity - the quality of being physically deep; "the profundity of the mine was almost a mile"
is a kind of deepness, depth
has particulars: bottomlessness
Antonym: shallowness
Derived forms adjective deep₃, adjective deep₈

3.  deepness(n = noun.attribute) depth - the extent downward or backward or inward; "the depth of the water"; "depth of a shelf"; "depth of a closet"
is a kind of extent
has particulars: deepness, profoundness, profundity, draft, draught, penetration, sounding, shallowness

4.  deepness(n = noun.attribute) - a low pitch that is loud and voluminous;
is a kind of low frequency, low pitch
Derived form adjective deep₆

N  depth, deepness, profundity, depression, hollow, pit, shaft, well, crater, gulf, bowels of the earth, botttomless pit, hell, soundings, depth of water, water, draught, submersion, plummet, sound, probe, sounding rod, sounding line, lead, bathymetry, sonar, side-looking sonar, bathometer, deep, deep seated, profound, sunk, buried, submerged, subaqueous, submarine, subterranean, subterraneous, subterrene, underground, bottomless, soundless, fathomless, unfathomed, unfathomable, abysmal, deep as a well, bathycolpian, benthal, benthopelagic, downreaching, yawning, knee deep, ankle deep, beyond one's depth, out of one's depth, over head and ears, mark twine, mark twain.