I've only been in one bad relationship from which to draw any description, but here are the words I came up with. I forget most things about that relationship, but sometimes it's helpful to remember where you've come from before lapsing once more into forgetfulness.
Inadequate
You're never as good as you need to be; even when you try your hardest he's not happy
Not knowledgeable
You're belittled when you don't know something and you're offered no explanation
Childish
You're spoken to as though you are a child, as though you should look up to him
Unintelligent
Your discussions ultimately come down to being told that you just don't understand
Lacking confidence
He says he likes it when you're confident, but it makes him more distant
Immature
You don't know as much as he does about relationships
Inexperienced
You aren't as good as the last one
Always at fault
Regardless of whose actions are being discussed, it always comes back to you
Isolated
You never see him when you are with your friends; if you are with anyone, it is his friends
Unimportant
You feel the need to remain silent when around other people, and you are not spoken to
Pressured
You feel a need to do things you don't want to do
Trapped
You feel as though if you left he wouldn't survive
Useless
You have no purpose besides sexual gratification or a silent companion when he's "lonely"