Synonyms|72Antonyms|1|Broader|0Narrower|0Related|8

61 entries under hard topic. ×

6
ferrous(adjective, strong, tough, sturdy)
3
iron(noun, adjective, strong, tough)
1
steel(adjective, strong, tough, sturdy)
0
adamant(adjective, strong, tough, sturdy)
0
adamantine(adjective, strong, tough, sturdy)
0
astringent(adjective, strong, tough, sturdy)
0
austere(adjective, strong, tough, sturdy)
0
authoritarian(adjective, strong, tough, sturdy)
0
bitter(adjective, strong, tough, sturdy)
0
bullheaded(adjective, strong, tough, sturdy)
0
by the book(expression, adjective, idiom, strong)
0
cruel(adjective, strong, tough, sturdy)
0
dense(adjective, strong, tough, sturdy)
0
determined(adjective, strong, tough)
0
disciplinary(adjective, strong, tough, sturdy)
0
dyed-in-the-wool(adjective, strong, tough, sturdy)
0
firm(adjective, strong, tough, sturdy)
0
flinty(adjective, strong, tough, sturdy)
0
forbidding(adjective, strong, tough, sturdy)
0
frowning(adjective, strong, tough, sturdy)
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ChicagoSmart Define. 2013. "ferric thesaurus" https://smartdefine.org/ferric/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2013, ferric thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/ferric/thesaurus/synonyms>.
MLASmart Define. "ferric thesaurus" 17 June 2013. Web. 24 September 2026. <https://smartdefine.org/ferric/thesaurus/synonyms>