64 entries under adjective topic. ×

4
cruel(rude, inconsiderate, unappreciative, unthankful)
4
futile
4
miserable
4
profitless
4
rude(inconsiderate, unappreciative, unthankful)
4
ungratifying
4
wretched
3
unmindful(inconsiderate, unappreciative, ingratitude)
3
unprofitable
3
unsung
2
barren
2
bootless
2
inappreciative(rude, inconsiderate, unappreciative, unthankful)
2
sour(unsatisfactory, fruitless, unfulfilling)
2
unacknowledged
2
undesired(pain, disagreeable, lousy, unwelcome)
1
difficult(unsatisfactory, trying, fruitless, unfulfilling)
1
dreary
1
offensive
1
tedious
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APASmart Define. (2015). thankless thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/thankless/thesaurus/synonyms
ChicagoSmart Define. 2015. "thankless thesaurus" https://smartdefine.org/thankless/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, thankless thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/thankless/thesaurus/synonyms>.
MLASmart Define. "thankless thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/thankless/thesaurus/synonyms>