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

308 entries under adjective topic. ×

2
compacted(set, strong, hard, firm)
2
concentrated(set, hard, tough, firm)
2
congested(close, solid, short, substantial)
2
consolidated(close, set, firm, solid)
2
dumb
2
expectant
2
formidable
2
grave
2
gravid
2
grievous
2
grueling
2
hardened(set, strong, hard, tough)
2
incompressible(firm, dense, density)
2
indiscernible
2
insensible(hard, unfeeling, unsympathetic, hardened)
2
insoluble(unable, unintelligibility, answered)
2
jam-packed(close, strong, solid, short)
2
monolithic
2
obfuscated
2
obtuse(hard, unfeeling, unsympathetic, prepared)
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APASmart Define. (2015). impenetrable thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/impenetrable/thesaurus/synonyms
ChicagoSmart Define. 2015. "impenetrable thesaurus" https://smartdefine.org/impenetrable/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, impenetrable thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/impenetrable/thesaurus/synonyms>.
MLASmart Define. "impenetrable thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/impenetrable/thesaurus/synonyms>