Here's why:
* Meaning: The word "employed" already conveys the idea of being "put to use" or "having a job". Adding a prefix might create a redundant or unclear meaning.
* Alternatives: If you need to express a specific nuance, you could use different words or phrases instead of adding a prefix.
For example, instead of "unemployed," you could use:
* Jobless
* Out of work
* Looking for work
* Without employment
If you could provide more context about what you're trying to express, I might be able to suggest a more specific and helpful alternative.