I would imagine that we all have our share of them - words that, when you hear them, automatically turn you off from a game. That doesn't have to mean that you don't look into them further or completely ignore them or anything, but still, a word that, when you see it, generally gives you a good idea you're probably not going to be interested in a game.
A couple for me:
FPS
Cinematic
Action
Bloody/Gore-filled/etc.
That isn't to say I hate all games where those terms could apply, but, generally, if it's one of the key terms used in describing/promoting the game, it's a pretty good sign I'm not going to be interested in it.
I'm sure there are plenty more, but those are just some of the more common.