This was his plan of amends—of atonement—for inheriting their father’s estate; and he thought it an excellent one, full of eligibility and suitableness, and excessively generous and disinterested on his own part.
Your sweetness and disinterestedness are really angelic; I do not know what to say to you.
The stupidity with which he was favoured by nature must guard his courtship from any charm that could make a woman wish for its continuance; and Miss Lucas, who accepted him solely from the pure and disinterested desire of an establishment, cared not how soon that establishment were gained.
His choice is disinterested at least, for he must know my father can give her nothing.
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.