Definition of "unconcerned"

[N]o attempt is made to call in God to their reſcue, as if he vvere an idle unconcern'd ſpectator of humane affairs, or ſo inconſiderable an ally, as not to be vvorth the care of engaging him on their ſide.

1660, [Richard Allestree], “Sect[ion] V. Of the Second Advantage, Wealth.”, in The Gentlemans Calling, London: […] T[imothy] Garthwait […], page 83

Often far away there I thought of these two, guarding the door of Darkness, knitting black wool as for a warm pall, one introducing, introducing, continuously to the unknown, the other scrutinising the cheery and foolish faces with unconcerned old eyes.

1899 February, Joseph Conrad, “The Heart of Darkness”, in Blackwood’s Edinburgh Magazine, volume CLXV, number M, New York, N.Y.: The Leonard Scott Publishing Company, […], part I, page 200

You understand the things that I've taught you: not to drink alcohol, not to use drugs. Don't use that cocaine or marijuana, because that stuff is highly addictive. When people become weed-heads they become sluggish, lazy, stupid, and unconcerned. Sluggish, lazy, stupid, and unconcerned. That's all marijuana does to you, okay?

2016, Frank Ocean, “Be Yourself”, in Blonde