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

308 entries under adjective topic. ×

1
lumbering
1
mighty
1
muddy(dark, gloomy, dense, cloudy)
1
mysterial(mysterious, secret, supernatural, hidden)
1
obdurate(hard, unfeeling, unsympathetic, hardened)
1
ossified(set, solid, heavy, deep)
1
pathless
1
ponderous
1
prepared(hard, unfeeling, unsympathetic, hardened)
1
rocklike(firm, stiff, rigid)
1
safe
1
seasoned(hard, unfeeling, unsympathetic, prepared)
1
secured
1
set(hard, tough, firm, solid)
1
short(close, sound, solid, fast)
1
sibylline
1
snug
1
sphinxlike(obscure, dark, strange, odd)
1
steeled(hard, unfeeling, unsympathetic, prepared)
1
sullen
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APASmart Define. (2015). impenetrable thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/impenetrable/thesaurus/synonyms
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>