In the following set of words, which is different than the others?

Question

Quizplus · Accepted Answer

Illiterate is an adjective used to describe someone who is unable to read or write. It is not similar to the words in the list (despite the similar spelling of the first few letters) since they all describe things that are not permissible according to the law.
Illegal is an adjective used to describe something that is contrary to or forbidden by the law. This is especially used in criminal circumstances. It is similar to the other words in the set (excluding 'illiterate') because they all describe things that are not permissible according to the law.
Illicit is an adjective used to describe something that is forbidden by laws or rules.
Illegitimate is an adjective used to describe something that is not authorized by the law.
Unauthorized is an adjective used to describe something that does not have official permission or approval. It is similar to the other words in the set (excluding 'illiterate') because they all describe things that are not permissible according to the law.

In the Following Set of Words, Which Is Different Than