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

45 entries under heavy topic. ×

2
stiff(adjective, set, hard, tough, firm)
1
caked(adjective, set, solid, deep)
1
clabbered(adjective, set, solid, deep)
1
close-grained(adjective, close, set, hard, tough)
1
clotted(adjective, set, solid, deep)
1
coagulated(adjective, set, solid, deep)
1
congealed(adjective, set, hard, tough, solid)
1
curdled(adjective, set, solid, deep)
1
fixed(adjective, set, solid, short)
1
gelatinous(adjective, set, solid, deep)
1
gloppy(adjective, set, solid, deep)
1
gooey(dense, concentrated)
1
gummous(adjective, set, solid, deep)
1
gunky(adjective, set, solid, deep)
1
jelled(adjective, set, hard, tough, solid)
1
jellied(adjective, set, solid, deep)
1
ossified(adjective, set, solid, deep)
1
ropy(dense, concentrated)
1
set(adjective, hard, tough, firm, solid)
1
sloppy(dense, concentrated)
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ChicagoSmart Define. 2015. "impenetrable thesaurus" https://smartdefine.org/impenetrable/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, impenetrable thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/impenetrable/thesaurus/synonyms>.
MLASmart Define. "impenetrable thesaurus" 10 April 2015. Web. 27 September 2026. <https://smartdefine.org/impenetrable/thesaurus/synonyms>