97 entries under cruel topic. ×

4
intemperate(adjective, hard, tough, severe, rough)
4
strait-laced(adjective, tough, severe, firm, harsh)
4
strenuous(adjective, hard, tough, severe, rough)
3
drastic(adjective, severe, harsh, brutal)
3
effortful(adjective, tough, rough, difficult, harsh)
3
fierce(adjective, hard, tough, harsh, intense)
3
hard-hearted(adjective, hard, tough, harsh)
3
heavy(adjective, strong, hard, tough, severe)
3
implacable(adjective, strong, hard, tough, harsh)
3
murderous(adjective, hard, tough, harsh)
3
pitiless(adjective, hard, tough, severe, harsh)
3
ruthless(adjective, hard, tough, harsh, unpleasant)
3
toilsome(adjective, hard, tough, severe, rough)
3
tyrannical(adjective, hard, tough, harsh)
2
cold(adjective, tough, severe, harsh)
2
ferocious(adjective, harsh, determined, fierce)
2
grinding(adjective, tough, severe, rough, difficult)
2
hard-nosed(adjective, strong, hard, tough, severe)
2
inhuman(adjective, hard, tough, harsh)
2
merciless(adjective, hard, tough, difficult, harsh)
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APASmart Define. (2016). rigorous thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/rigorous/thesaurus/synonyms
ChicagoSmart Define. 2016. "rigorous thesaurus" https://smartdefine.org/rigorous/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, rigorous thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/rigorous/thesaurus/synonyms>.
MLASmart Define. "rigorous thesaurus" 26 February 2016. Web. 28 September 2026. <https://smartdefine.org/rigorous/thesaurus/synonyms>