|Heroic Action Role-Play|
You are deaf or very hard of hearing. You cannot hear what people say, but you are a reasonably good lip reader and can read a lot from posture - not enough to carry on a normal conversation but enough that you do not need to have everything constantly explained to you. You are fluent in sign language. In situations where hearing is important, you can't use the Perception element of your skills and have to rely on raw Mind.
If hearing is critical to as task, you automatically fail. Snakeyes rolls on actions where your lack of hearing could possibly impede you always fail.