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

141 entries under tough topic. ×

2
sturdy(adjective, strong, hard, sound)
2
vigorous(adjective, strong, hard, sound)
1
able(adjective, strong, sound, solid)
1
able-bodied(adjective, strong, sound, solid)
1
active(adjective, strong, sound, solid)
1
aloof(adjective, hard, firm, indifferent)
1
athletic(adjective, strong, sound, solid)
1
big(adjective, strong, sound, solid)
1
callous(adjective, set, strong, hard)
1
capable(adjective, strong, sound, solid)
1
cold fish(expression, adjective, harsh, cruel)
1
crisp(adjective, firm, fixed, distant)
1
cruel(adjective, strong, hard, vicious)
1
distant(adjective, firm, fixed, rigid)
1
do or die(expression, adjective, idiom, firm)
1
dug in(expression, adjective, firm, distant)
1
durable(adjective, strong, hard, sound)
1
enduring(adjective, strong, sound, solid)
1
energetic(adjective, strong, sound, solid)
1
firm(adjective, set, strong, hard, sound)
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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>