profundity
profoundness
intellectual depth, penetrating knowledge, keen insight, etc.
the depth of my feeling
the profoundness of the silence
deepness
the quality of being physically deep
the profundity of the mine was almost a mile
astuteness
depth
the intellectual ability to penetrate deeply into ideas
reconditeness
abstruseness
abstrusity
wisdom that is recondite and abstruse and profound
the anthropologist was impressed by the reconditeness of the native proverbs