Categories of Antonyms
There are three categories of antonyms:
Graded antonyms - deal with levels of the meaning of the words, like if something is not “good”, is may still not be “bad.” There is a scale involved with some words, and besides good and bad there can be average, fair, excellent, terrible, poor, or satisfactory.
Complementary antonyms - have a relationship where there is no middle ground. There are only two possibilities, either one or the other.