What is a prefix you can add to legible?

Here are some prefixes you can add to "legible" to create new words with slightly different meanings:

* Illegible: Means "not able to be read."

* Semi-legible: Means "partially able to be read."

* Unreadable: Means "impossible to read."

* Incomprehensible: Means "unable to be understood." (This is a broader term, but can be used in the context of writing.)

The most common prefix for "legible" is il-, creating illegible.