As well as being asked to post about this by a number of people, I’ve also seen these two used incorrectly a number of times. I think negative versions of words do get people confused – and why not, when you have odd things like “flammable” and “inflammable” knocking around …
These two don’t mean the opposite of one another, but they do have distinct, separate and different meanings.
Uninterested means not interested. “I was uninterested in his plans for world domination”; “the cat remained uninterested in my new party dress”
Disinterested means impartial. I think this must be connected with the idea of “declaring an interest”; the disinterested person has no interest or investment in either side of an argument. “Amid all the disucssions, the chair remained a disinterested party, keeping order between the warring sides.”
If you aren’t keen on sitting on the fence and want to get involved, you could quite easily be uninterested in being disinterested …
You can find more troublesome pairs here.








