Don't let it bother you; put it out of your mind.
I don't want to continue with this conversation (usually used in frustration or anger).
It doesn't matter.
A conventional reply to an expression of gratitude.
Absolutely not; I forbid it or it is impossible.
Giving no ground of hope; promising nothing desirable; desperate.
Without talent, not skilled.
Incurable.
Without hope; despairing; not expecting anything positive.