5
inattentive(adjective, dull, neglect, indifferent, unsympathetic)
5
light-hearted(adjective, feature, state, trait)
5
neutral(adjective, calm, cool, relaxed, cold)
5
passive(adjective, indifferent, lethargic, languid, indolent)
5
reckless(adjective, feature, state, neglect, trait)
5
sluggish(adjective, lethargic, languid, indolent)
5
slutty(adjective, attitude, behavior, sexual moral, sexual activity)
5
supine(adjective, neglect, cold, indifferent, dead)
5
undisturbed(adjective, feature, state, calm, indifferent)
5
unflappable(adjective, calm, cool, attitude, relaxed)
5
unmotivated
4
Laodicean(adjective, cold, dead, apathy, passive)
4
blase(adjective, calm, cool, relaxed, cold)
4
cheerful(adjective, feature, state, keen, happy)
4
effortless(adjective, calm, cool, relaxed, detached)
4
frigid(adjective, cold, dead, apathy, indifference)
4
incidental
4
lethargic(adjective, languid, indolent)
4
liberal(adjective, attitude, behavior, permissive, complacent)
4
mild(adjective, feature, state, relaxed, trait)
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APASmart Define. (2015). insouciant thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/insouciant/thesaurus/synonyms
ChicagoSmart Define. 2015. "insouciant thesaurus" https://smartdefine.org/insouciant/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, insouciant thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/insouciant/thesaurus/synonyms>.
MLASmart Define. "insouciant thesaurus" 14 April 2015. Web. 29 September 2026. <https://smartdefine.org/insouciant/thesaurus/synonyms>