The Collaborative International Dictionary of English v.0.48:

Uncharitable \Un*char"i*ta*ble\, a.
   Not charitable; contrary to charity; severe in judging;
   harsh; censorious; as, uncharitable opinions or zeal.
   --Addison. -- Un*char"i*ta*ble*ness, n. --
   Un*char"i*ta*bly, adv.
   [1913 Webster]

WordNet (r) 3.0 (2006):

uncharitable
    adj 1: lacking love and generosity; "all pious words and
           uncharitable deeds"- Charles Reade [ant: charitable]