The word "disinterested" is often incorrectly thought to mean "not interested," when it really means "impartial." In fact, I think I remember reading something that this word may eventually either be taken out of the "official" language, or have its meaning changed to mean "not interested" after all. Or at least, I read something sort of like that.
*minor thread hijack* "Disinterested" in the sense of "having no interest" has been in use since at least 1647 according to the Oxford English Dictionary. And there is no "official language" for English/American English, although, the OED is about as canonical (cough) as you can get. Different publishers of dictionaries use different criteria for determining what words gain entry to their publications. */minor thread hijack*
But, hey! now women can fight and die right along with the men in the U.S. Military!
Big step!