What is the suffix Illegally?

"Illegally" is not a suffix. It's an adverb formed by adding the suffix "-ly" to the adjective "illegal".

Here's a breakdown:

* Illegal: This is the adjective form, meaning "not allowed by law."

* -ly: This is the suffix that turns an adjective into an adverb, indicating how something is done.

Therefore, "illegally" means "in a way that is not allowed by law."