Did you ever in your novel reading come across the old situation of the disinterested wife falling in love with her own husband?
He was polite and disinterested and she missed his interest, perverse though it had been, missed the old days of bickering and retort.
She was powerless against his cool mind, his disinterested words.
Well, I should hate to lose your friendship," she said primly and, with an attempt at disinterestedness, bent down to pull the blanket closer about Ella Lorena’s head.
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.