deepness

noun

1.
the intellectual ability to penetrate deeply into ideas
astuteness depth profoundness profundity
Derived from:
deep
2.
the quality of being physically deep
profoundness profundity
Antonym:
shallowness
Derived from:
deep
3.
the extent downward or backward or inward
depth
4.
a low pitch that is loud and voluminous
Derived from:
deep