4
unforgiving(adjective, rocky, pebbly)
4
unrelenting(adjective, close, strong, hard, tough)
3
calloused
3
dark
3
dense(adjective, strong, hard, tough, solid)
3
dour
3
granitelike
3
hardhearted
3
immovable(adjective, strong, hard, tough, sturdy)
3
inexorable(adjective, close, strong, hard, tough)
3
inhuman(adjective, evil, nasty, harsh, vicious)
3
insensitive
3
iron
3
rough(adjective, strong, hard, tough, serious)
3
rugged(adjective, strong, hard, tough, harsh)
3
steadfast
3
uncompromising
2
austere(adjective, strong, hard, tough, severe)
2
barbarous(adjective, evil, nasty, harsh, vicious)
2
brutish(adjective, evil, nasty, harsh, vicious)
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APASmart Define. (2015). flinty thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/flinty/thesaurus/synonyms
ChicagoSmart Define. 2015. "flinty thesaurus" https://smartdefine.org/flinty/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, flinty thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/flinty/thesaurus/synonyms>.
MLASmart Define. "flinty thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/flinty/thesaurus/synonyms>