308 entries under adjective topic. ×

1
close-grained(close, set, hard, tough)
1
clotted(set, solid, heavy, deep)
1
coagulated(set, solid, heavy, deep)
1
coldhearted(hard, unfeeling, unsympathetic, prepared)
1
complicated
1
confusing
1
congealed(set, hard, tough, solid)
1
contemptuous(hard, unfeeling, unsympathetic, prepared)
1
cruel(hard, unfeeling, unsympathetic, hardened)
1
curdled(set, solid, heavy, deep)
1
disdainful(hard, unfeeling, unsympathetic, prepared)
1
fast
1
fixed(set, solid, heavy, short)
1
gelatinous(set, solid, heavy, deep)
1
gloppy(set, solid, heavy, deep)
1
gruelling
1
gummous(set, solid, heavy, deep)
1
gunky(set, solid, heavy, deep)
1
habituated(hard, unfeeling, unsympathetic, prepared)
1
hard-as-nails(hard, unfeeling, unsympathetic, prepared)
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APASmart Define. (2015). impenetrable thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/impenetrable/thesaurus/synonyms
ChicagoSmart Define. 2015. "impenetrable thesaurus" https://smartdefine.org/impenetrable/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, impenetrable thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/impenetrable/thesaurus/synonyms>.
MLASmart Define. "impenetrable thesaurus" 10 April 2015. Web. 28 September 2026. <https://smartdefine.org/impenetrable/thesaurus/synonyms>