Synonyms of the word 
UNREWARDING → PROFITLESS - THANKLESS - UNAPPRECIATED - UNGRATIFYING - UNPROFITABLE
unrewarding
- adj. Not providing reward or satisfaction.
profitless
- adj. not yielding profit.
thankless
- adj. (of a task) not appreciated or rewarded.
- adj. (of a person) ungrateful or unappreciative.
unappreciated
- adj. Not deemed to have any value.
- adj. (of an investment) Not having risen in value.
ungratifying
- adj. Not providing gratification.
unprofitable
- adj. Not making a profit.
If you are interested in words, visit the following sites :
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- 1word.ws/unrewarding to play with words, suffixs, prefixs, etc.