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

307 entries under adjective topic. ×

1
resolute(tough, firm, fixed, serious)
1
rigid(set, strong, hard, tough)
1
roll with punches(expression, idiom, calm, cool)
1
seasoned(strong, hard, solid, stiff)
1
secure(strong, sound, tough, solid)
1
sedate(calm, cool, steady, unaffected)
1
self-possessed(calm, cool, steady, tranquil)
1
self-satisfied(calm, cool, steady, tranquil)
1
set in stone(expression, idiom, tough, firm)
1
severe(tough, firm, harsh, fixed)
1
sinewy(strong, hard, sound, tough)
1
single-minded(tough, firm, fixed, serious)
1
smug(calm, cool, steady, tranquil)
1
sound(strong, tough, solid, heavy)
1
stable(strong, sound, tough, solid)
1
standing pat(expression, tough, firm, distant)
1
stark(strong, sound, tough, solid)
1
staunch(strong, sound, tough, solid)
1
steady(calm, strong, cool, sound)
1
steeled(strong, hard, solid, stiff)
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APASmart Define. (2015). hard as nails thesaurus. Retrieved September 29, 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 29, 2026).
HarvardSmart Define 2015, hard as nails thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/hard_as_nails/thesaurus/synonyms>.
MLASmart Define. "hard as nails thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/hard_as_nails/thesaurus/synonyms>