22 entries under sour topic. ×

1
unremitting(adjective, hard, tough, harsh, cruel)
1
vindictive(adjective, hard, tough, harsh, cruel)
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APASmart Define. (2015). unrepenting thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/unrepenting/thesaurus/synonyms
ChicagoSmart Define. 2015. "unrepenting thesaurus" https://smartdefine.org/unrepenting/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, unrepenting thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/unrepenting/thesaurus/synonyms>.
MLASmart Define. "unrepenting thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/unrepenting/thesaurus/synonyms>