I was listening to an NPR report about the Boston Marathon trial, and the defendant, Dzhokhar Tsarnaev, was described as appearing “disinterested.” I would bet my life he looked “uninterested.” Certainly the judge and jurors should be disinterested, but not the defendant.
“Disinterested” means unbiased; how could Tsarnaev possibly be unbiased at his own trial? He might have looked as if he was unbiased, but in no way could that be true.
Of course, in time these two words will become synonymous for “not caring” because that is the way so many people are using them today. Maybe I’m the last holdout. People will no longer use “disinterested” to mean “unbiased” and the latter will be used in its stead. But until next Tuesday, a distinction still exists.