superfluous
A word often used by a know-it-all wannabe in an attempt to sound smart.
Person 1: "You know, some people consider me a genius." Person 2: "Yeah right! I've seen garden hoses with more braincells then you." Person 1: "How very superfluous of you." Person 2: "You have absolutely no idea what that means, do you?" Person 1: "..."
By Shquiggles