Synonyms|251Antonyms|39|Broader|2Narrower|0Related|383

81 entries under hard topic. ×

2
unadaptable(resolute, rigid, inflexible, strict)
2
unchangeable(resolute, rigid, inflexible, strict)
1
austere(adjective, strong, tough, severe)
1
authoritarian(adjective, strong, tough, sturdy)
1
callous(adjective, set, strong, firm)
1
dyed-in-the-wool(adjective, set, strong, tough)
1
hard-line(adjective, strong, tough, severe)
1
indomitable(adjective, set, strong, tough)
1
insensible(adjective, strong, tough, sturdy)
1
staunch(resolute, rigid, inflexible, strict)
1
stringent(adjective, severe, stiff, resolute)
1
thick(adjective, strong, tough, firm)
1
unsparing(adjective, strong, tough, sturdy)
0
astringent(adjective, strong, tough, sturdy)
0
bitter(adjective, strong, tough, sturdy)
0
by the book(expression, adjective, idiom, strong)
0
compact(adjective, set, strong, firm)
0
compacted(adjective, set, strong, firm)
0
compressed(adjective, set, strong, firm)
0
concentrated(adjective, set, strong, firm)
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ChicagoSmart Define. 2015. "adamantine thesaurus" https://smartdefine.org/adamantine/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, adamantine thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/adamantine/thesaurus/synonyms>.
MLASmart Define. "adamantine thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/adamantine/thesaurus/synonyms>