Uninterested is the opposite of interested. It simply means you have no interest in something:
He's totally uninterested in traveling. He likes where he lives and never wants to leave.
We approached the other company and proposed a partnership, but they were uninterested.
In casual spoken English, we tend to say "not interested" for the word uninterested.
The word disinterested means somebody is neutral. They have no bias (opinions that could unfairly influence their judgment). If two people are having an argument, they should present the case to a disinterested third party who can give a clear and fair evaluation of the situation.
However, some people do mistakenly use "disinterested" where "uninterested" would be more accurate.
Extraordinary Science Ever thought of a fuel efficient Tank, think of the Ground Combat Vehicle, desgined by BAE Systems. This 84-ton GCV will be heavier than the battle tanks which the army currently uses. BAE says the hybrid system will trim fuel and maintenance costs so much that costs over the life of the tank will be lower. Believe it or not the GCV can reach upto speeds of 20mph while carrying 12 people.