In Russian, жалость (zhalost), "pity" (our translation), comes from жалеть, to feel pity for someone, and is related to жаль, "it is a pity." It is the word with which the prince tells Rogozhin how he loves Nastasya, with pity and not with love, and with which the narrator describes what her face has stirred in him since the portrait; the prince repeats it to Aglaya on the green bench, when he says that he only feels pity for her.
Where It Appears
Quotes
I love her not with love, but with pity.
Part Two: The Painting, Myshkin
That I only feel pity for her, and that I... no longer love her.
Part Three: The Explanation, Myshkin
if you start to talk about something like the death penalty, or the economic situation of Russia, or of "beauty will save the world," then... I, of course, will be delighted and laugh heartily, but... I warn you in advance: do not show yourself before my eyes afterward!