52 entries under set topic. ×

3
strong(adjective, close, hard, secure)
2
callous(adjective, hard, firm, stiff)
2
compacted(adjective, strong, hard, firm)
2
concentrated(adjective, hard, tough, firm)
2
consolidated(adjective, close, firm, solid)
2
hardened(adjective, strong, hard, tough)
2
solidified(adjective, hard, tough, solid)
2
stiff(adjective, hard, tough, firm)
1
caked(adjective, solid, heavy, deep)
1
clabbered(adjective, solid, heavy, deep)
1
close-grained(adjective, close, hard, tough)
1
clotted(adjective, solid, heavy, deep)
1
coagulated(adjective, solid, heavy, deep)
1
congealed(adjective, hard, tough, solid)
1
curdled(adjective, solid, heavy, deep)
1
fixed(adjective, solid, heavy, short)
1
gelatinous(adjective, solid, heavy, deep)
1
gloppy(adjective, solid, heavy, deep)
1
gummous(adjective, solid, heavy, deep)
1
gunky(adjective, solid, heavy, deep)
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APASmart Define. (2015). impenetrable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/impenetrable/thesaurus/synonyms
ChicagoSmart Define. 2015. "impenetrable thesaurus" https://smartdefine.org/impenetrable/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, impenetrable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/impenetrable/thesaurus/synonyms>.
MLASmart Define. "impenetrable thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/impenetrable/thesaurus/synonyms>