A word which has the opposite meaning of another word.
A word that describes one end of a scale, while its opposite describes the other end, such as large versus small; a gradable antonym.
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.