57 entries under tough topic. ×

25
adamantine(adjective, strong, hard, firm)
21
hard(adjective, strong, severe, evil)
15
cruel(adjective, strong, hard, severe)
15
steely(adjective, strong, hard, firm)
14
unyielding(adjective, strong, hard, severe)
13
rigid(adjective, strong, hard, severe)
12
adamant(adjective, strong, hard, firm)
11
firm(adjective, strong, hard, severe)
11
obdurate(adjective, close, strong, hard)
9
severe(adjective, strong, hard, harsh)
8
harsh(adjective, strong, hard, severe)
8
inflexible(adjective, strong, hard, severe)
6
unbending(adjective, close, strong, hard)
5
grim(adjective, close, strong, hard)
5
relentless(adjective, close, strong, hard)
4
rigorous(adjective, strong, hard, severe)
4
unrelenting(adjective, close, strong, hard)
3
dense(adjective, strong, hard, solid)
3
immovable(adjective, strong, hard, sturdy)
3
inexorable(adjective, close, strong, hard)
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APASmart Define. (2015). flinty thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/flinty/thesaurus/synonyms
ChicagoSmart Define. 2015. "flinty thesaurus" https://smartdefine.org/flinty/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, flinty thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/flinty/thesaurus/synonyms>.
MLASmart Define. "flinty thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/flinty/thesaurus/synonyms>