The Collaborative International Dictionary
Rewardable
Rewardable \Re*ward"a*ble\, a. Worthy of reward. -- Re*ward"a*ble*ness, n. -- Re*ward"a*bly, adv.
Wiktionary
rewardable
a. 1 Worthy of reward. 2 Capable of being rewarded.
WordNet
rewardable
adj. appropriate for receiving a reward