16 entries under rude topic. ×

20
ungrateful(adjective, difficult, inconsiderate, grateful)
16
unthankful(adjective, inconsiderate, grateful, churlish)
11
thoughtless(adjective, inconsiderate, unappreciative, ungrateful)
11
unappreciative(adjective, grateful, churlish, ungrateful)
9
unpleasant(adjective, pain, disagreeable, lousy)
8
heedless(adjective, inconsiderate, churlish, unappreciative)
5
careless(adjective, inconsiderate, churlish, unappreciative)
5
self-centered(adjective, inconsiderate, churlish, unappreciative)
5
ungracious(adjective, inconsiderate, churlish, unappreciative)
4
cruel(adjective, inconsiderate, unappreciative, unthankful)
4
impolite
4
unmannerly
3
disrespectful
3
unceremonious
3
uncivil
2
inappreciative(adjective, inconsiderate, unappreciative, unthankful)
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APASmart Define. (2015). thankless thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/thankless/thesaurus/synonyms
ChicagoSmart Define. 2015. "thankless thesaurus" https://smartdefine.org/thankless/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, thankless thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/thankless/thesaurus/synonyms>.
MLASmart Define. "thankless thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/thankless/thesaurus/synonyms>