That's so... [fill in the blank]

I'm trying to excise the word "retarded" from my vocabulary as an all-purpose insult or synonym for "stupid." I've seen some discussions online about why it's offensive to some people-- similar to the reason a lot of people aren't really crazy about the use of the term "that's so gay" to mean "that's so stupid and/or corny."

But old habits die hard- I just busted out with it a few days ago, totally out of the blue, without thought. It's not even a term I use that often, but it was just odd that I used it pretty much within a few weeks of deciding I was going to stop using it that way.

Incidentally, it's OK if you think I'm a dork or being overly-political-correct about this- it's a personal decision I'm making to try to be more sensitive and thoughtful in the way I speak.