Definition of "disinterested"

Sir, you have a right to that kind of respect, and are arguing for yourself. I am supporting the principle, and am disinterested in doing it, as I have no such right.

1791, James Boswell, Life of Samuel Johnson

With his disinterested passion for art, he had a real desire to call the attention of the wise to a talent which was in the highest degree original; [...]

1919, W[illiam] Somerset Maugham, “chapter 1”, in The Moon and Sixpence, [New York, N.Y.]: Grosset & Dunlap Publishers […]

People are better off abjuring violence, if everyone else agrees to do so, and vesting authority in a disinterested third party.

2011, Steven Pinker, The Better Angels of Our Nature, Penguin, published 2012, page 220

were primarily concerned with epistemology and the foundations of the sciences; they often spoke as if we were separated from the real world by a screen of "representations" or "sense-data"; they tended to regard our approach to the world as one of disinterested observation.

2014 April 12, Michael Inwood, “Martin Heidegger: the philosopher who fell for Hitler [print version: Hitler's philosopher]”, in The Daily Telegraph (Review)‎, London, page R10

How dis-interested are they in all Worldly matters, since they fling their Wealth and Riches into the Sea.

1684, Contempl. State of Man I. x

Robin took to wandering again, to intermittent travel from which she came back hours, days later, disinterested.

1936, Djuna Barnes, Nightwood, Faber & Faber, published 2007, page 43

Those spotted are usually taught so slowly that they grow disinterested and quit.

1967, Tommy Frazer, The Sun (Baltimore), "A 'Doctor' Of Karate", March 27