Synonyms|404Antonyms|106|Broader|1Narrower|0Related|115

141 entries under tough topic. ×

1
reinforced(adjective, strong, sound, solid)
1
relentless(adjective, strong, hard, firm)
1
reserved(adjective, firm, fixed, distant)
1
resolute(adjective, firm, fixed, serious)
1
rigid(adjective, set, strong, hard)
1
secure(adjective, strong, sound, solid)
1
set in stone(expression, adjective, idiom, firm)
1
severe(adjective, firm, harsh, fixed)
1
sinewy(adjective, strong, hard, sound)
1
single-minded(adjective, firm, fixed, serious)
1
sound(adjective, strong, solid, heavy)
1
stable(adjective, strong, sound, solid)
1
standing pat(expression, adjective, firm, distant)
1
stark(adjective, strong, sound, solid)
1
staunch(adjective, strong, sound, solid)
1
steady(adjective, calm, strong, cool, sound)
1
stern(adjective, severe, harsh, cruel)
1
stiff(adjective, set, strong, hard)
1
strict(adjective, severe, firm, harsh)
1
substantial(adjective, strong, sound, solid)
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APASmart Define. (2015). hard as nails thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/hard_as_nails/thesaurus/synonyms
ChicagoSmart Define. 2015. "hard as nails thesaurus" https://smartdefine.org/hard_as_nails/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, hard as nails thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/hard_as_nails/thesaurus/synonyms>.
MLASmart Define. "hard as nails thesaurus" 10 April 2015. Web. 30 September 2026. <https://smartdefine.org/hard_as_nails/thesaurus/synonyms>