64 entries under adjective topic. ×

20
ungrateful(difficult, rude, inconsiderate, grateful)
16
unthankful(rude, inconsiderate, grateful, churlish)
11
thoughtless(rude, inconsiderate, unappreciative, ungrateful)
11
unappreciative(rude, grateful, churlish, ungrateful)
10
unrequited
9
unappreciated
9
unpleasant(pain, rude, disagreeable, lousy)
8
disagreeable(pain, unpleasant, lousy, unsatisfactory)
8
heedless(rude, inconsiderate, churlish, unappreciative)
8
unrewarding(difficult, unsatisfactory, trying, fruitless)
7
distasteful(pain, disagreeable, lousy, unsatisfactory)
6
fruitless(difficult, unsatisfactory, trying, unappreciated)
6
unwelcome(pain, disagreeable, lousy, annoying)
6
useless
6
vain
5
careless(rude, inconsiderate, churlish, unappreciative)
5
displeasing(noun, pain, unpleasant, disagreeable)
5
self-centered(rude, inconsiderate, churlish, unappreciative)
5
ungracious(rude, inconsiderate, churlish, unappreciative)
4
bad(pain, unsatisfactory, fruitless, unfulfilling)
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APASmart Define. (2015). thankless thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/thankless/thesaurus/synonyms
ChicagoSmart Define. 2015. "thankless thesaurus" https://smartdefine.org/thankless/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, thankless thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/thankless/thesaurus/synonyms>.
MLASmart Define. "thankless thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/thankless/thesaurus/synonyms>