77 entries under strong topic. ×

31
tough(adjective, hard, firm, harsh)
25
adamantine(adjective, hard, tough, firm)
21
hard(adjective, tough, severe, evil)
21
unbreakable(adjective, hard, firm, solid)
15
cruel(adjective, hard, tough, severe)
15
steely(adjective, hard, tough, firm)
14
unyielding(adjective, hard, tough, severe)
13
rigid(adjective, hard, tough, severe)
12
adamant(adjective, hard, tough, firm)
11
firm(adjective, hard, tough, severe)
11
obdurate(adjective, close, hard, tough)
9
severe(adjective, hard, tough, harsh)
8
harsh(adjective, hard, tough, severe)
8
inflexible(adjective, hard, tough, severe)
6
unbending(adjective, close, hard, tough)
5
grim(adjective, close, hard, tough)
5
relentless(adjective, close, hard, tough)
5
stiff(adjective, hard, severe, harsh)
4
rigorous(adjective, hard, tough, severe)
4
unrelenting(adjective, close, hard, tough)
11 years ago|7.3k views|share |citing 
APASmart Define. (2015). flinty thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/flinty/thesaurus/synonyms
ChicagoSmart Define. 2015. "flinty thesaurus" https://smartdefine.org/flinty/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, flinty thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/flinty/thesaurus/synonyms>.
MLASmart Define. "flinty thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/flinty/thesaurus/synonyms>