How about simplistic when the word is used as a synonym for simple, which it is not.
Simplistic always implies OVER simplification of something (to the point where something important is lost) and is always used in a negative way.
It especially sticks out when the context tells me that it meant to be a complement.
Simplistic is never complementary.
Usually used someone trying to look smart by using a two-euro word when a one-euro word would do.
Lindy