1
concentrated(adjective, set, hard, tough, solid)
1
concrete(adjective, set, hard, tough, solid)
1
condensed(adjective, set, hard, tough, solid)
1
congealed(adjective, set, hard, tough, solid)
1
consolidated(adjective, set, solid, heavy, deep)
1
corrosionproof
1
crotchety
1
crowded(adjective, set, solid, heavy, deep)
1
curdled(adjective, set, solid, heavy, deep)
1
dampproof
1
dead-hearted(adjective, bad, cold, aloof, no feelings)
1
dead-pan(adjective, bad, cold, aloof, no feelings)
1
deep(adjective, set, solid, heavy, stiff)
1
desperate
1
detached(adjective, indifferent, distant, apathetic, unfeeling)
1
diffident(adjective, indifferent, detached, distant, apathetic)
1
disinterested(adjective, indifferent, detached, distant, apathetic)
1
dispassionate(adjective, calm, indifferent, restrained, detached)
1
distant(adjective, indifferent, detached, apathetic, unfeeling)
1
dogmatic
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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>