The word pair disinterested/uninterested is one that sparks some debate in certain circles. As you may be aware, the present day, prescribed definitions are the reverse of what they were several hundred years ago, as a trip to your friendly local OED will confirm (or even AHD4 at http://www.bartleby.com/61/32/D0273200.html). David Carkeet, in his light-hearted TVR article in the September issue (http://www.vocabula.com/2003/VRSept03Carkeet.htm) points out that these words, among others, do not exactly lend themselves to a great stability in meaning. I.e., there is nothing particular about the word disinterested that speaks for it meaning unbiased, impartial as opposed to lacking in interest.

Can anyone think of any other pairs of words that would belong to this dis/un family?