89 entries under tough topic. ×

1
uncontrite(adjective, hard, harsh, cruel)
1
uncooperative(adjective, mean, hard, harsh)
1
uncordial(adjective, hard, severe, cold)
1
unimpressible(adjective, mean, hard, harsh)
1
unregenerate(adjective, hard, harsh, cruel)
1
unremitting(adjective, hard, harsh, cruel)
1
unrepenting(adjective, hard, harsh, cruel)
1
unshakable(adjective, mean, hard, harsh)
1
vindictive(adjective, mean, hard, nasty)
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APASmart Define. (2016). hard-hearted thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/hard-hearted/thesaurus/synonyms
ChicagoSmart Define. 2016. "hard-hearted thesaurus" https://smartdefine.org/hard-hearted/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2016, hard-hearted thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/hard-hearted/thesaurus/synonyms>.
MLASmart Define. "hard-hearted thesaurus" 24 March 2016. Web. 30 September 2026. <https://smartdefine.org/hard-hearted/thesaurus/synonyms>