Disinterested vs. UninterestedHow to use "disinterested" and "uninterested" correctly
Some grammar police insist that disinterested should only be used to mean “unbiased or neutral” and should not be used as a synonym for uninterested (“not interested”). Although the history of the usage of these words is actually more complicated, this distinction is actually a useful one to remember and follow.
a fair, disinterested judgment
have a disinterested observer monitor the fairness of the process
uninterested students snoring and drooling
Common Errors in English Usage: Errors in diction and idiom commonly made by native speakers of English
List of Common Errors in English Usage (PDF): Printable version of the complete list
Common Grammar Errors: A list of common errors in grammar (topics like subject-verb agreement and parallelism) as distinct from usage