From latest Vocabula Review:
"He was one of those
men who take the news very seriously, almost seeming to brood over
it, but in a way I found attractive. He thought Bill Clinton clownish
and outrageous, but also thought the degradation of him wasn't at
all good for the country. He thought about things like that — the
good of the country — in a way that suggested genuine disinterest of
a sort that has long ago gone out of style.

This usage conforms with the first definition in my dictionary. But I find myself using the
second definition only.

disinterest
n.
1 lack of personal or selfish interest; disinterestedness
2 lack of interest or concern; indifference

Comments, please.