nouns
extremeness of degree
"the profoundness of his ignorance"
is a type of (narrower)
the state or degree of being ultimate; the final or most extreme in degree or size or time or distance, "the ultimacy of these social values"
wisdom that is recondite and abstruse and profound
"the anthropologist was impressed by the reconditeness of the native proverbs"
the intellectual ability to penetrate deeply into ideas
the quality of being physically deep
"the profundity of the mine was almost a mile"
intellectual depth; penetrating knowledge; keen insight; etc
"the depth of my feeling"; "the profoundness of the silence"