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

74 entries under tough topic. ×

2
hard-boiled(adjective, strong, hard, sturdy)
2
hard-core(adjective, strong, hard, sturdy)
2
harsh(adjective, strong, hard, severe)
2
heavy(adjective, strong, hard, sturdy)
2
severe(adjective, strong, hard, harsh)
2
strict(adjective, set, strong, hard)
1
austere(adjective, strong, hard, severe)
1
authoritarian(adjective, strong, hard, sturdy)
1
dyed-in-the-wool(adjective, set, strong, hard)
1
hard-line(adjective, strong, hard, severe)
1
indomitable(adjective, set, strong, hard)
1
insensible(adjective, strong, hard, sturdy)
1
recalcitrant(firm, unreasonable, grim, obstinate)
1
single-minded(firm, cruel, stiff, strict)
1
thick(adjective, strong, hard, firm)
1
unsparing(adjective, strong, hard, sturdy)
0
armored(adjective, strong, permanent, strengthened)
0
astringent(adjective, strong, hard, sturdy)
0
bitter(adjective, strong, hard, sturdy)
0
by the book(expression, adjective, idiom, strong, hard)
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ChicagoSmart Define. 2015. "adamantine thesaurus" https://smartdefine.org/adamantine/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, adamantine thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/adamantine/thesaurus/synonyms>.
MLASmart Define. "adamantine thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/adamantine/thesaurus/synonyms>