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Webster 1913 Edition

Adj.

Worthy of reward.

–

Re-ward′a-ble-ness

Noun.

–

Re-ward′a-bly

adv.

Adj.

That may be rewarded; worthy of recompense.

rewardable ‎(comparative more rewardable, superlative most rewardable)

Worthy of reward.
Capable of being rewarded.
- Jeremy Taylor
  To which may be added this advantage, that the services of churchmen are rewardable upon the church's stock: no need to disimprove the royal banks to pay thanks to bishops.