Synonyms|713Antonyms|152|Broader|9Narrower|8Related|663

55 entries under stiff topic. ×

1
gummous(adjective, set, solid, heavy, deep)
1
gunky(adjective, set, solid, heavy, deep)
1
indurated(adjective, set, hard, firm)
1
jelled(adjective, set, hard, tough, solid)
1
jellied(adjective, set, solid, heavy, deep)
1
ossified(adjective, set, solid, heavy, deep)
1
rocklike(adjective, firm, rigid)
1
set(adjective, hard, tough, firm, solid)
1
syrupy(adjective, set, solid, heavy, deep)
1
thickened(adjective, set, solid, heavy, deep)
1
turbid(adjective, dull, set, solid, dark)
1
vitrified(adjective, set, solid, heavy, deep)
0
durable(adjective, firm, rigid)
0
indurate(adjective, set, strong, hard, firm)
0
iron(adjective, set, strong, hard, firm)
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ChicagoSmart Define. 2015. "impenetrable thesaurus" https://smartdefine.org/impenetrable/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, impenetrable thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/impenetrable/thesaurus/synonyms>.
MLASmart Define. "impenetrable thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/impenetrable/thesaurus/synonyms>