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 (money, time, resources, etc.)
   "an ungenerous response to the appeal for funds";
   - stingy [informal]

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

Antonym: generous