Synonyms of the word 
UNAPPRECIATED → THANKLESS - UNACKNOWLEDGED - UNGRATIFYING - UNREWARDING - UNSUNG - UNVALUED
unappreciated
- adj. Not deemed to have any value.
- adj. (of an investment) Not having risen in value.
thankless
- adj. (of a task) not appreciated or rewarded.
- adj. (of a person) ungrateful or unappreciative.
unacknowledged
- adj. Not acknowledged.
ungratifying
- adj. Not providing gratification.
unrewarding
- adj. Not providing reward or satisfaction.
unsung
- adj. Which has not been lauded or appreciated.
- adj. Not sung.
unvalued
- adj. Not valued; not appraised.
- adj. Not considered; disregarded; valueless; as.
- adj. (obsolete) Having inestimable value; invaluable.
If you are interested in words, visit the following sites :
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- 1word.ws/unappreciated to play with words, suffixs, prefixs, etc.