The Collaborative International Dictionary of English v.0.48:

Ungenerous \Un*gen"er*ous\, a.
   Not generous; illiberal; ignoble; unkind; dishonorable.
   [1913 Webster]

         The victor never will impose on Cato
         Ungenerous terms.                        --Addison.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ungenerous
    adj 1: lacking in magnanimity; "it seems ungenerous to end this
           review of a splendid work of scholarship on a critical
           note"- Times Litt. Sup.; "a meanspirited man unwilling to
           forgive" [syn: ungenerous, meanspirited] [ant:
           generous]
    2: unwilling to spend; "she practices economy without being
       stingy"; "an ungenerous response to the appeal for funds"
       [syn: stingy, ungenerous] [ant: generous]

Moby Thesaurus II by Grady Ward, 1.0:

69 Moby Thesaurus words for "ungenerous":
   authoritarian, avaricious, bigot, bigoted, borne, cheap, close,
   closed, closefisted, constricted, cramped, creedbound, deaf,
   deaf to reason, fanatical, hardfisted, hidebound, illiberal,
   inconsequent, inconsequential, inconsiderable, insular, little,
   little-minded, mean, mean-minded, mean-spirited, mingy, miserly,
   narrow, narrow-hearted, narrow-minded, narrow-souled,
   narrow-spirited, near, nearsighted, niggardly, paltry, parochial,
   parsimonious, peanut, penny-pinching, penurious, petty, picayune,
   pinchfisted, pinching, provincial, puny, purblind, save-all,
   shortsighted, small, small-minded, stingy, straitlaced, stuffy,
   tight, tightfisted, trifling, unaltruistic, unbeneficent,
   unbenevolent, uncatholic, uncharitable, unchivalrous, ungiving,
   unliberal, unphilanthropic