Instead of using labels, it's better to describe the situation in a neutral and accurate way. Here are some options:
* "People who are illiterate" is a neutral and widely understood term.
* "People with limited literacy skills" is a more specific term that acknowledges that there are different levels of literacy.
* "People who have difficulty reading and writing" is a descriptive phrase that avoids labeling.
It's also important to avoid using terms like "illiterate" or "functional illiterate" in a derogatory way. These terms can be hurtful and perpetuate negative stereotypes.
Remember, it's always best to be respectful and focus on the individual's abilities and needs.