How about I wish my dad was dead?
I hope you are joking. Why do you not like your dad?
I am tired of listening to him badmouthing my success
We can't always get along with our family members, but it's wrong to wish anyone dead. You should go to a therapist to work through the anger you have for your dad so that you can move forward in your life.
I thought my dad was a waste of space. I won't be happy unless he is dead.
It's normal that people sometimes don't get along with their parents, but to wish death upon him is a bit extreme. I understand he is hard on you, but I think that actually made you more successful than you would have been if it were not for him. Maybe he just wants to push you to your full potential, so if he knows that you wish him dead, it might be very hurtful to him.