The person is insouciant. You can't have an insouciant indifference. "Insouciant" is a close synonym of "carefree".
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
The person is insouciant. You can't have an insouciant indifference. "Insouciant" is a close synonym of "carefree". "Blithe" is more like "uncaring" but in a breezy way, not callous. "Insouciant" is high register. "Blithe" is of even higher register verging on poetical except in some collocations like "blithe indifference". "Blithe" owes any currency it has to the famous poem "To a Skylark", b
Neither of these words is in common usage.
Google ngram's results for "Blithe" are dominated by the use of "Blithe" as a proper name, or reference to the play "Blithe Spirit". The word comes from Old English. It has deep roots in the language, but is hardly used anymore.
The frequency is much much less for insouciant. I cannot remember the last time I encountered it, and I