My favorite has to be the word ambiguous and to a lesser extend unambiguous. My professors overuse and misuse them all the time. Leave it to pretensious people to use the worg unambiguous when instead they could use the word clear. I believe most words have a place in writing and speeches, but colloquial speech doesn't need such words. Unless of course, you're trying to show off.
I also like the word "dynamic," especially when used in the business world. Most people have no idea what it means. I swear they'll turn to someone and say "my, that's such a dynamic tie you're wearing!" - and it's not a holographic tie...