124 entries under tough topic. ×

1
forceful(adjective, strong, severe, firm)
1
frowning(adjective, strong, hard, severe)
1
hang-tough(adjective, strong, hard, harsh)
1
hard-shell(adjective, strong, hard, severe)
1
hard-shelled(adjective, hard, severe, rough)
1
hard as nails(expression, adjective, idiom, set, hard)
1
heavy(adjective, strong, hard, severe)
1
insensible(adjective, strong, hard, careless)
1
jelled(adjective, hard, firm, solid)
1
mortified(adjective, strong, hard, severe)
1
ornery(adjective, firm, unreasonable, grim)
1
serious(adjective, strong, hard, severe)
1
stout(adjective, strong, hard, firm)
1
thick(adjective, strong, hard, firm)
1
unreasonable(firm, obstinate, stubborn, willful)
1
untoward(firm, unreasonable, obstinate, stubborn)
0
close-grained(hard, solid, rigid)
0
ferric(adjective, strong, hard, sturdy)
0
ferrous(adjective, strong, hard, sturdy)
0
fine-grained(hard, solid, rigid)
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APASmart Define. (2016). inflexible thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/inflexible/thesaurus/synonyms
ChicagoSmart Define. 2016. "inflexible thesaurus" https://smartdefine.org/inflexible/thesaurus/synonyms (accessed October 1, 2026).
HarvardSmart Define 2016, inflexible thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/inflexible/thesaurus/synonyms>.
MLASmart Define. "inflexible thesaurus" 24 March 2016. Web. 1 October 2026. <https://smartdefine.org/inflexible/thesaurus/synonyms>