Definitions of ungenerous:

• adjective:   lacking in largess

  Example: "An ungenerous response to an appeal for funds"

• adjective:   lacking in magnanimity

  Example: "It seems ungenerous to end this review of a splendid work of scholarship on a critical note- Times Litt. Sup."

• adjective:   selfishly unwilling to share with others
• adjective:   not generous

  Example: "An ungenerous response to the appeal for funds"