1
hang-tough(adjective, strong, hard, tough, severe)
1
hard-boiled(adjective, strong, hard, tough, severe)
1
hard-line(adjective, strong, hard, tough, severe)
1
hard-nosed(adjective, close, strong, hard, tough)
1
hard-shell(adjective, strong, hard, tough, severe)
1
hardheaded(adjective, strong, hard, tough, severe)
1
hateful(adjective, evil, nasty, harsh, vicious)
1
heavy-handed
1
hellish(adjective, evil, nasty, harsh, vicious)
1
immutable
1
impliable
1
inclement
1
inconsiderate
1
indurated
1
inelastic
1
inhumane(adjective, evil, nasty, harsh, vicious)
1
intransigent
1
inured
1
iron-hard
1
ironlike
11 years ago|7.3k views|share |citing 
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>