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

49 entries under rigid topic. ×

6
steely(adjective, firm, unyielding)
5
adamant(adjective, firm, unyielding, steely)
5
nonporous(hard, solid, resistant, impervious)
5
packed(adjective, close, set, hard, firm)
5
substantial(adjective, close, set, strong, hard)
5
unyielding(adjective, set, hard, tough, firm)
4
concrete(adjective, set, hard, tough, solid)
3
inflexible(adjective, set, strong, hard, tough)
3
strong(adjective, close, set, hard, secure)
2
callous(adjective, set, hard, firm, stiff)
2
compacted(adjective, set, strong, hard, firm)
2
concentrated(adjective, set, hard, tough, firm)
2
consolidated(adjective, close, set, firm, solid)
2
hardened(adjective, set, strong, hard, tough)
2
solidified(adjective, set, hard, tough, solid)
2
stiff(adjective, set, hard, tough, firm)
1
close-grained(adjective, close, set, hard, tough)
1
congealed(adjective, set, hard, tough, solid)
1
indurated(adjective, set, hard, firm, stiff)
1
jelled(adjective, set, hard, tough, solid)
For more, visit Impenetrable on Power Thesaurus
11 years ago|15k views|share |citing 
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>