1
beyond reach
1
blase(indifferent, detached, distant, apathetic, unfeeling)
1
bombproof
1
brute(adjective, bad, cold, aloof, no feelings)
1
burglarproof
1
buttoned up(expression, adjective, secure, safe, snug)
1
caked(adjective, set, solid, heavy, deep)
1
calloused
1
calm(adjective, restrained, detached, unconcerned, subdued)
1
casehardened
1
casual(adjective, calm, restrained, unconcerned, subdued)
1
cherished(adjective, secure, safe, snug, intact)
1
chill(adjective, bad, cold, aloof, no feelings)
1
clabbered(adjective, set, solid, heavy, deep)
1
closed forever to(expression, idiom)
1
clotted(adjective, set, solid, heavy, deep)
1
coagulated(adjective, set, solid, heavy, deep)
1
cold-blooded(adjective, bad, cold, aloof, no feelings)
1
cold fish(expression, adjective, calm, restrained, subdued)
1
compressed(adjective, set, hard, tough, solid)
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APASmart Define. (2015). impervious thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/impervious/thesaurus/synonyms
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>