75 entries under hard topic. ×

14
insensitive(noun, adjective, dull, slow)
9
opaque(adjective, slow)
7
imperceptive(adjective, obscure, difficult, slow)
6
crass(adjective, indifferent, coarse, vulgar)
6
impassive(adjective, dull, slow, stupid)
6
insensible(adjective, innocent, unfeeling, unsympathetic)
6
thick-skinned(noun, adjective, indifferent, unfeeling)
5
apathetic(adjective, dull, unfeeling, unsympathetic)
4
unfeeling(noun, adjective, indifferent, unsympathetic)
4
benumbed(adjective, dull, unfeeling, unsympathetic)
4
callous(noun, adjective, indifferent, unfeeling)
4
coldhearted(adjective, indifferent, aloof, unfeeling)
4
heartless(adjective, indifferent, aloof, unfeeling)
4
unemotional(adjective, dull, unfeeling, unsympathetic)
4
unresponsive(adjective, dull, simple, indifferent)
3
insensate(noun, adjective, dull, simple)
3
insusceptible(adjective, insensitive, unsusceptible)
3
tactless(adjective, indifferent, vulgar, thoughtless)
3
torpid(adjective, dull, slow, stupid)
3
unsusceptible(noun, adjective, indifferent, unfeeling)
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APASmart Define. (2015). obtuse thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/obtuse/thesaurus/synonyms
ChicagoSmart Define. 2015. "obtuse thesaurus" https://smartdefine.org/obtuse/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, obtuse thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/obtuse/thesaurus/synonyms>.
MLASmart Define. "obtuse thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/obtuse/thesaurus/synonyms>