And he’s ready to do that in spite of all his nobility and disinterestedness.
I have never doubted his disinterestedness and his honesty …. his scrupulous honesty …. in money matters.
According to all accounts, he had even in the past, whenever the subject of the three thousand roubles was touched on, flown into a perfect frenzy, and yet he was reported to be a disinterested and not grasping man.
There are no more uses of "disinterested" in the book.
Show samples from other sources
All the Finches had straight incisive eyebrows and heavy-lidded eyes; when they looked slant-wise, up, or straight ahead, a disinterested observer would catch a glimpse of what May-comb called Family Resemblance.
Harper Lee -- Go Set a Watchman
He looks up at them, disinterested and maybe disgusted by the baby, because he wanders deeper into the recesses of the cluttered store to get away.