Source : Webster's Revised Unabridged Dictionary (1913)

Poorness \Poor"ness\, n.
   The quality or state of being poor (in any of the senses of
   the adjective). --Bacon.

Source : WordNet®

poorness
     n 1: the state of having little or no money and few or no
          material possessions [syn: {poverty}, {impoverishment}]
          [ant: {wealth}]
     2: less than adequate; "the relative poorness of New England
        farmland"
     3: the quality of being meager; "an exiguity of cloth that
        would only allow of miniature capes"-George Eliot [syn: {meagerness},
         {meagreness}, {scantiness}, {scantness}, {exiguity}]
     4: the quality of being poorly made or maintained; "she was
        unrecognizable because of the poorness of the photography"