21 entries under unsusceptible topic. ×

11
impassive(adjective, hard, temper, cold, indifferent)
9
insensitive(adjective, quiet, bad, hard, temper)
7
insusceptible(adjective, hard, affect, dead, impassive)
4
heartless(hard, insensitive, insensibility)
4
unimpressionable(adjective, hard, affect, dead, impassive)
4
unresponsive(adjective, quiet, bad, hard, cold)
3
bloodless(adjective, hard, difficult, troubled, inflexible)
3
thick-skinned(adjective, hard, insensitive)
2
coldhearted(adjective, hard, insensitive)
2
hard(inflexible, insensitive, unyielding)
2
obtuse(hard, insensitive)
0
crass(hard, insensitive)
0
feelingless(adjective, hard, impassive, insensitive)
0
hard as nails(expression, adjective, idiom, hard, impassive)
0
hardened(hard, insensitive)
0
hardhearted(hard, insensitive)
0
imperceptive(adjective, hard, impassive, insensitive)
0
incurious(hard, insensitive)
0
stony(hard, cold, indifferent, insensitive, unyielding)
0
tactless(hard, insensitive)
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APASmart Define. (2015). impassible thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/impassible/thesaurus/synonyms
ChicagoSmart Define. 2015. "impassible thesaurus" https://smartdefine.org/impassible/thesaurus/synonyms (accessed October 1, 2026).
HarvardSmart Define 2015, impassible thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/impassible/thesaurus/synonyms>.
MLASmart Define. "impassible thesaurus" 14 April 2015. Web. 1 October 2026. <https://smartdefine.org/impassible/thesaurus/synonyms>