Synonyms|127Antonyms|52|Broader|0Narrower|0Related|569

11 entries under severe topic. ×

20
adamantine(adjective, strong, tough, firm)
9
unyielding(adjective, strong, hard, tough)
8
rigid(adjective, strong, hard, firm)
6
firm(adjective, strong, hard, tough)
5
solid(adjective, strong, hard, tough)
5
hard(adjective, strong, firm, harsh)
2
harsh(adjective, firm, solid, stiff)
2
stiff(adjective, strong, hard, firm)
1
definite(adjective, firm, harsh, solid)
1
inflexible(adjective, strong, hard, firm)
1
set(adjective, firm, harsh, solid)
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APASmart Define. (2016). unbreakable thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/unbreakable/thesaurus/synonyms
ChicagoSmart Define. 2016. "unbreakable thesaurus" https://smartdefine.org/unbreakable/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, unbreakable thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/unbreakable/thesaurus/synonyms>.
MLASmart Define. "unbreakable thesaurus" 5 January 2016. Web. 24 September 2026. <https://smartdefine.org/unbreakable/thesaurus/synonyms>