Source : Webster's Revised Unabridged Dictionary (1913)

Profundity \Pro*fun"di*ty\, 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.

Source : WordNet®

profundity
     n 1: wisdom that is recondite and abstruse and profound; "the
          anthropologist was impressed by the reconditeness of the
          native proverbs" [syn: {reconditeness}, {abstruseness},
          {abstrusity}, {profoundness}]
     2: intellectual depth; penetrating knowledge; keen insight;
        etc; "the depth of my feeling"; "the profoundness of the
        silence" [syn: {profoundness}] [ant: {superficiality}]
     3: the intellectual ability to penetrate deeply into ideas
        [syn: {astuteness}, {profoundness}, {depth}]
     4: the quality of being physically deep; "the profundity of the
        mine was almost a mile" [syn: {deepness}, {profoundness}]
        [ant: {shallowness}]