Absurd. Something that is extremely odd. Can refer to something good or bad depend on the context.
Not a word in the 'main-stream' vocabular. More likely to be found in the 'geek' vocabulary.
If one or more specific instances of a class of items or persons have a negative quality, all items or persons of that class must be considered to have that same negative quality.
1) There are some bad salespeople; therefore, all salespeople are bad.
2) I once owned a Honda that broke down; therefore, all Hondas are junk.