Synonyms|713Antonyms|152|Broader|9Narrower|8Related|663
5
dark(adjective, obscure, deep, ambiguous, cryptic)
3
more difficult
3
unkillable
2
cheap
2
dense
2
important
2
predicament
2
stoic(adjective, apathetic, emotionless, cold-blooded, impassible)
2
thick
1
incomprehensible
1
invious
1
niggardly
1
nun's folded veil
1
powerful
1
psionics(adjective, extrasensory, supernaturalism)
1
solid-state chemistry
1
wonderful(adjective, great, excellent, superior, superb)
0
Delphic
0
a1
0
abdominous
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APASmart Define. (2015). impenetrable thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/impenetrable/thesaurus/related
ChicagoSmart Define. 2015. "impenetrable thesaurus" https://smartdefine.org/impenetrable/thesaurus/related (accessed September 24, 2026).
HarvardSmart Define 2015, impenetrable thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/impenetrable/thesaurus/related>.
MLASmart Define. "impenetrable thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/impenetrable/thesaurus/related>