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

125 entries under dense topic. ×

8
tight(adjective, close, solid, short, substantial)
7
condensed(adjective, set, hard, tough, solid)
7
murky(adjective, obscure, solid, dark, gloomy)
7
unknowable(adjective, obscure, solid, dark, superior)
6
cloudy(adjective, dark, gloomy, misty)
6
compressed(adjective, set, hard, tough, firm)
6
unaccountable(adjective, obscure, solid, strange, doubtful)
5
hidden(adjective, obscure, difficult, solid, dark)
5
packed(adjective, close, set, hard, firm)
5
substantial(adjective, close, set, strong, hard)
4
cabalistic(adjective, obscure, solid, strange, odd)
4
concrete(adjective, set, hard, tough, solid)
4
difficult(adjective, obscure, dark, strange, odd)
4
dim(adjective, dark, gloomy, cloudy)
4
hermetic(adjective, fast, short, unaffected)
3
crowded(adjective, close, set, solid, heavy)
3
dull(adjective, dark, gloomy, cloudy)
3
enigmatical(adjective, solid, strange, supernatural)
2
compacted(adjective, set, strong, hard, firm)
2
concentrated(adjective, set, hard, tough, firm)
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HarvardSmart Define 2015, impenetrable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/impenetrable/thesaurus/synonyms>.
MLASmart Define. "impenetrable thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/impenetrable/thesaurus/synonyms>