1
inhuman(adjective, bad, cold, aloof, no feelings)
1
innavigable
1
insentient(adjective, bad, cold, aloof, no feelings)
1
intact(adjective, secure, safe, snug, sheltered)
1
invincible(adjective, invulnerable)
1
iron-hearted(adjective, bad, cold, aloof, no feelings)
1
irresponsive(adjective, bad, cold, aloof, no feelings)
1
jelled(adjective, set, hard, tough, solid)
1
jellied(adjective, set, solid, heavy, deep)
1
ladder-proof
1
laid-back(adjective, calm, restrained, unconcerned, subdued)
1
listless(adjective, indifferent, detached, distant, apathetic)
1
lost to
1
lukewarm(adjective, calm, restrained, subdued, impassive)
1
maintained(adjective, secure, safe, snug, intact)
1
marble(adjective, bad, cold, aloof, no feelings)
1
marble-hearted(adjective, bad, cold, aloof, no feelings)
1
moth-resistant
1
mothproof
1
neutral(adjective, indifferent, detached, distant, apathetic)
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APASmart Define. (2015). impervious thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/impervious/thesaurus/synonyms
ChicagoSmart Define. 2015. "impervious thesaurus" https://smartdefine.org/impervious/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, impervious thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/impervious/thesaurus/synonyms>.
MLASmart Define. "impervious thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/impervious/thesaurus/synonyms>