I'd never seen this splendid word until today, but I feel compelled to bring it to the public's attention:
pococurante - adjective \ˈpō-kō-kyu̇-ˈran-tē meaning indifferent, nonchalant. From the Italian for "caring little"
It may have found its origin, capitalised, as a character in Voltaire's Candide.
There's a lovely non-capitalised usage in an essay on Lord Melbourne, by Abraham Hayward, published in 1858.
...during … during many years he apparently led a careless, indolent, pococurante life, divided between the gay circles of London and the House of Commons.