Synonyms of the word 
UNGRATIFYING → THANKLESS - UNAPPRECIATED - UNREWARDING
ungratifying
- adj. Not providing gratification.
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.
unrewarding
- adj. Not providing reward or satisfaction.
If you are interested in words, visit the following sites :
- wiktionary.org/ungratifying For complete definition of a word
- 1word.ws/ungratifying to play with words, suffixs, prefixs, etc.