spareness

from WordNet (r) 3.0 (2006)

spareness
    n 1: the property of being scanty or scattered; lacking
         denseness [syn: {sparseness}, {spareness}, {sparsity},
         {thinness}]
    2: the property of having little body fat [syn: {leanness},
       {thinness}, {spareness}] [ant: {avoirdupois}, {blubber},
       {fat}, {fatness}]

from The Collaborative International Dictionary of English v.0.48

Spareness \Spare"ness\, n. [Cf. AS. spaernis frugality.]
   The quality or state of being lean or thin; leanness.
   [1913 Webster]