67 entries under severe topic. ×

1
compassionless(adjective, mean, hard, harsh)
1
cutthroat(adjective, mean, hard, harsh)
1
disciplinary(adjective, strong, hard, tough)
1
dog-eat-dog(adjective, mean, hard, harsh)
1
dyed-in-the-wool(adjective, set, strong, hard, tough)
1
forbidding(adjective, appearance, strong, hard, tough)
1
frowning(adjective, strong, hard, tough)
1
gratuitous(adjective, mean, harsh, cruel)
1
hard-line(adjective, strong, hard, tough)
1
hardhearted(adjective, mean, hard, harsh)
1
hatchet job(expression, adjective, mean, harsh)
1
having a killer instinct(expression, adjective, idiom, mean)
1
iron-fisted(adjective, mean, harsh, cruel)
1
mean(adjective, animal, hard, nasty)
1
mean machine(expression, adjective, mean, harsh)
1
monstrous(adjective, evil, nasty, harsh)
1
mortified(adjective, strong, hard, tough)
1
rough(adjective, strong, hard, tough)
1
tyrannous(harsh, cruel)
1
uncalled-for(adjective, mean, harsh, cruel)
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APASmart Define. (2016). implacable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/implacable/thesaurus/synonyms
ChicagoSmart Define. 2016. "implacable thesaurus" https://smartdefine.org/implacable/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, implacable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/implacable/thesaurus/synonyms>.
MLASmart Define. "implacable thesaurus" 24 March 2016. Web. 21 September 2026. <https://smartdefine.org/implacable/thesaurus/synonyms>