Synonyms|578Antonyms|103|Broader|5Narrower|10Related|232
3
unpierceable(adjective, unyielding, unbending, unable, unreceptive)
2
aloof(adjective, calm, indifferent, restrained, detached)
2
anesthetic
2
bigoted
2
bulletproof
2
case-hardened
2
close(adjective, set, hard, tough, solid)
2
dead
2
dense(adjective, set, hard, tough, solid)
2
durable(adjective, sturdy, enduring)
2
flinty
2
hardhearted(adjective, unfeeling, unresponsive, insensible, oblivious)
2
imperforate
2
imperturbable(adjective, calm, restrained, subdued, impassive)
2
insensate(noun, adjective, bad, cold, aloof)
2
obdurate(adjective, unyielding, unbending, unreceptive)
2
obstinate
2
obtuse(noun, adjective, unresponsive, oblivious, unmoved)
2
out of reach(expression, idiom, impossibility)
2
proof against(verb, phrasal verb, insensibility)
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ChicagoSmart Define. 2015. "impervious thesaurus" https://smartdefine.org/impervious/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, impervious thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/impervious/thesaurus/synonyms>.
MLASmart Define. "impervious thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/impervious/thesaurus/synonyms>