5
unrewarding
4
disappointing(verb, adjective)
3
thankless
3
unappreciated
2
distressing
2
heartbreaking
2
heartrending
2
profitless
2
ungratifying
2
upsetting(adjective, worthless)
1
cheerless
1
cold
1
demoralizing
1
depressing
1
difficult
1
discomforting
1
disconcerting
1
discouraging
1
disgruntling
1
disheartening
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APASmart Define. (2015). rewarding thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/rewarding/thesaurus/antonyms
ChicagoSmart Define. 2015. "rewarding thesaurus" https://smartdefine.org/rewarding/thesaurus/antonyms (accessed September 23, 2026).
HarvardSmart Define 2015, rewarding thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/rewarding/thesaurus/antonyms>.
MLASmart Define. "rewarding thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/rewarding/thesaurus/antonyms>