Antonyms for Building Vocabulary
The word antonym itself takes the Greek word anti, meaning "opposite," and adds it to -onym, which comes from the Greek onoma, or "name." So antonym literally means "opposite-name." Hence, a word that has the exact opposite meaning of another word is its antonym. Most antonyms can be formed by simply adding prefixes such as im, in, dis, un.
Here is a list of antonyms for your better understanding.