Source : Webster's Revised Unabridged Dictionary (1913)

Fewness \Few"ness\, n.
   1. The state of being few; smallness of number; paucity.
      --Shak.

   2. Brevity; conciseness. [Obs.] --Shak.

Source : WordNet®

fewness
     n : the quality of being small in number