Answer:
permitted - illegal
unharmed - injured
ordinary - beautiful
sullen - cheerful
Explanation:
Antonyms are words that have opposite meanings, e.g. good and bad.
If something is permitted, you are officially allowed to do it, and if it's illegal, you are not. These two meanings are opposite, and that's why permitted and illegal are antonyms. The rest of the pairs can be formed the same way. You can look up the definitions of words in a dictionary and compare them, or search in a thesaurus - a list of words with their synonyms and antonyms.
