Synonyms|713Antonyms|152|Broader|9Narrower|8Related|663
1
close-grained(adjective, close, set, hard, tough)
1
close-textured
1
close-woven
1
closed forever to(expression, idiom)
1
clotted(adjective, set, solid, heavy, deep)
1
coagulated(adjective, set, solid, heavy, deep)
1
coherent
1
cohesive
1
coldhearted(adjective, hard, unfeeling, unsympathetic, prepared)
1
complicated
1
concealed(obscure, dark, superior, strange, mysterious)
1
confusing
1
congealed(adjective, set, hard, tough, solid)
1
constipated
1
contemptuous(adjective, hard, unfeeling, unsympathetic, prepared)
1
covert
1
crammed full
1
cruel(adjective, hard, unfeeling, unsympathetic, hardened)
1
crystalline
1
curdled(adjective, set, solid, heavy, deep)
<1…678910>
For more, visit Impenetrable on Power Thesaurus
11 years ago|15k views|share |citing 
APASmart Define. (2015). impenetrable thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/impenetrable/thesaurus/synonyms
ChicagoSmart Define. 2015. "impenetrable thesaurus" https://smartdefine.org/impenetrable/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, impenetrable thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/impenetrable/thesaurus/synonyms>.
MLASmart Define. "impenetrable thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/impenetrable/thesaurus/synonyms>