Synonyms|266Antonyms|6|Broader|1Narrower|4Related|4

56 entries under sturdy topic. ×

1
implacable(adjective, strong, hard, tough, severe)
1
inexorable(adjective, strong, hard, tough, severe)
1
inflexible(adjective, strong, hard, tough, severe)
1
mortified(adjective, strong, hard, tough, severe)
1
mulish(adjective, strong, hard, tough, severe)
1
relentless(adjective, strong, hard, tough, severe)
1
rigid(adjective, strong, hard, tough, severe)
1
rigorous(adjective, strong, hard, tough, severe)
1
rough(adjective, strong, hard, tough, severe)
1
serious(adjective, strong, hard, tough, severe)
1
severe(adjective, strong, hard, tough, harsh)
1
steely(adjective, strong, hard, tough, severe)
1
stiff-necked(adjective, strong, hard, tough, severe)
1
strict(adjective, strong, hard, tough, severe)
1
tough(adjective, strong, hard, severe, harsh)
1
unrelenting(adjective, strong, hard, tough, severe)
1
unsparing(adjective, strong, hard, tough, harsh)
0
adamant(adjective, strong, hard, tough)
0
adamantine(adjective, strong, hard, tough)
0
dense(adjective, strong, hard, tough)
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ChicagoSmart Define. 2013. "by the book thesaurus" https://smartdefine.org/by_the_book/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2013, by the book thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/by_the_book/thesaurus/synonyms>.
MLASmart Define. "by the book thesaurus" 19 May 2013. Web. 30 September 2026. <https://smartdefine.org/by_the_book/thesaurus/synonyms>