Uninterested means not interested and disinterested can also mean not interested, or it can mean unbiased. Originally I believe disinterested only had the second meaning, but so many people misused it that the first meaning has become common. This website explains in more detail: http://grammar.quickanddirtytips.com/disinterested-versus-uninterested.aspx

If there is disinterest in something, people are uninterested in it. 有道字典查一下各种例句多，意思全，以下来自有道，你也可以用有道的权威词典查词。没有必要问。 He's always on the make; I have never known him do a disinterested action. 他这个人一贯都是唯利是图， 我从来不知道他有什么无私的行动。 Day by day, he misses China, and is uninterested in America. 日子一天天过去，他想念中国，对美国不感兴趣。