(n) intellectual depth; penetrating knowledge; keen insight; etc, Syn. profoundness, Ant. superficiality, Example:the depth of my feeling; the profoundness of the silence
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
n.; pl.-ties [ L. profunditas: cf. F. profondite. See Profound. ] The quality or state of being profound; depth of place, knowledge, feeling, etc. “The vast profundity obscure.” Milton. [ 1913 Webster ]