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

307 entries under adjective topic. ×

2
resistant(strong, hard, solid, stiff)
2
robust(strong, hard, sound, tough)
2
rocky(set, strong, hard, compact)
2
solid(set, strong, hard, sound)
2
steely(strong, hard, tough, stiff)
2
stony(set, strong, hard, indifferent)
2
stout(strong, hard, sound, tough)
2
strapping(strong, hard, sound, tough)
2
strong-willed(serious, resolute, persistent, driven)
2
sturdy(strong, hard, sound, tough)
2
vigorous(strong, hard, sound, tough)
1
able(strong, sound, tough, solid)
1
able-bodied(strong, sound, tough, solid)
1
active(strong, sound, tough, solid)
1
aloof(hard, tough, firm, indifferent)
1
assured(calm, cool, steady, tranquil)
1
athletic(strong, sound, tough, solid)
1
big(strong, sound, tough, solid)
1
bloodless(hard, indifferent, unkind, unresponsive)
1
brawny(strong, hard, solid, powerful)
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APASmart Define. (2015). hard as nails thesaurus. Retrieved September 28, 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 28, 2026).
HarvardSmart Define 2015, hard as nails thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/hard_as_nails/thesaurus/synonyms>.
MLASmart Define. "hard as nails thesaurus" 10 April 2015. Web. 28 September 2026. <https://smartdefine.org/hard_as_nails/thesaurus/synonyms>