1
indifferent(adjective, calm, cool, relaxed, cold)
1
indurate(adjective, mean, hard, tough, harsh)
1
indurated(adjective, cool, blank, aloof, unemotional)
1
inexcitable(adjective, cool, blank, aloof, unemotional)
1
inexorable(adjective, mean, hard, tough, harsh)
1
inexpressive(adjective, cool, blank, aloof, unemotional)
1
inflexible(adjective, mean, hard, harsh, stubborn)
1
inscrutable(adjective, cool, blank, aloof, unemotional)
1
insensible(adjective, cool, indifferent, blank, aloof)
1
insentient
1
insouciant(adjective, calm, cool, relaxed, detached)
1
iron(adjective, mean, hard, tough, harsh)
1
laid back(expression, adjective, calm, cool, relaxed)
1
light(adjective, calm, cool, relaxed, detached)
1
loose(adjective, calm, cool, relaxed, detached)
1
matter-of-fact(adjective, cool, blank, aloof, unemotional)
1
mean(adjective, hard, tough, harsh, unfeeling)
1
mulish(adjective, mean, hard, harsh, inflexible)
1
neglectful(adjective, calm, cool, relaxed, detached)
1
negligent(adjective, calm, cool, relaxed, detached)
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APASmart Define. (2015). unimpressible thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/unimpressible/thesaurus/synonyms
ChicagoSmart Define. 2015. "unimpressible thesaurus" https://smartdefine.org/unimpressible/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, unimpressible thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/unimpressible/thesaurus/synonyms>.
MLASmart Define. "unimpressible thesaurus" 14 April 2015. Web. 30 September 2026. <https://smartdefine.org/unimpressible/thesaurus/synonyms>