50 entries under unbending topic. ×

20
impervious(adjective, set, hard, tough, solid)
16
impermeable(adjective, close, hard, tough, solid)
12
invulnerable(adjective, unaffected, unyielding, safety)
8
inaccessible(adjective, hard, unfeeling, unsympathetic, prepared)
8
tight(adjective, close, solid, short, substantial)
5
immune(adjective, unaffected, unyielding, resistant)
5
unyielding(adjective, set, hard, tough, firm)
3
resistant(adjective, hard, unfeeling, unsympathetic, prepared)
3
rigid(adjective, set, strong, hard, tough)
2
callous(adjective, set, hard, firm, stiff)
2
closed to(expression, unaffected, unyielding, resistant)
2
obtuse(adjective, hard, unfeeling, unsympathetic, prepared)
2
unapproachable(unaffected, unyielding, resistant, unreceptive)
2
unpierceable(unaffected, unyielding, resistant, unreceptive)
1
accustomed(adjective, hard, unfeeling, unsympathetic, prepared)
1
benumbed(adjective, hard, unfeeling, unsympathetic, prepared)
1
case-hardened(adjective, hard, unfeeling, unsympathetic, prepared)
1
coldhearted(adjective, hard, unfeeling, unsympathetic, prepared)
1
contemptuous(adjective, hard, unfeeling, unsympathetic, prepared)
1
cruel(adjective, hard, unfeeling, unsympathetic, hardened)
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APASmart Define. (2015). impenetrable thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/impenetrable/thesaurus/synonyms
ChicagoSmart Define. 2015. "impenetrable thesaurus" https://smartdefine.org/impenetrable/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, impenetrable thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/impenetrable/thesaurus/synonyms>.
MLASmart Define. "impenetrable thesaurus" 10 April 2015. Web. 27 September 2026. <https://smartdefine.org/impenetrable/thesaurus/synonyms>