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]