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

107 entries under strong topic. ×

1
sinewy(adjective, hard, sound, tough)
1
sound(adjective, tough, solid, heavy)
1
stable(adjective, sound, tough, solid)
1
stark(adjective, sound, tough, solid)
1
staunch(adjective, sound, tough, solid)
1
steady(adjective, calm, cool, sound)
1
steeled(adjective, hard, solid, stiff)
1
stiff(adjective, set, hard, tough)
1
substantial(adjective, sound, tough, solid)
1
tenacious(adjective, hard, sound, tough)
1
tough as nails(expression, adjective, idiom, hard)
1
unbending(adjective, hard, tough, fixed)
1
unyielding(adjective, hard, sound, tough)
1
well-built(adjective, sound, tough, solid)
1
well-founded(adjective, sound, tough, solid)
1
well-made(adjective, sound, tough, solid)
0
adamant(adjective, hard, tough, fixed)
0
adamantine(adjective, set, hard, tough)
0
cohesive(adjective, hard, solid, stiff)
0
compact(adjective, set, hard, stubborn)
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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>