WordWeb Online

1. Lacking in magnanimity
   "it seems ungenerous to end this review of a splendid work of scholarship on a critical note"
   - meanspirited, begrudging
    
2. Unwilling to spend
   "an ungenerous response to the appeal for funds"
   - stingy

See also: beggarly, cheap, cheeseparing, chinchy, chintzy [N. Amer], close, closefisted, generosity, generousness, grudging, hardfisted, mean, mingy, miserly, near, niggardly, parsimonious, penny-pinching, penurious, scrimy, self-interested, selfish, skinny, tight, tightfisted, uncharitable

Antonym: generous