Source : Webster's Revised Unabridged Dictionary (1913)

Nothingness \Noth"ing*ness\, n.
   1. Nihility; nonexistence.

   2. The state of being of no value; a thing of no value.

Source : WordNet®

nothingness
     n 1: the state of nonexistence [syn: {void}, {nullity}]
     2: empty rhetoric or insincere or exaggerated talk; "that's a
        lot of wind"; "don't give me any of that jazz" [syn: {wind},
         {idle words}, {jazz}]