* Impatient is already a complete word with a clear meaning. Adding prefixes like "un-" or "in-" would be redundant.
* "Imp-" itself is a prefix meaning "not" or "lacking," already present in "impatient."
However, you can use synonyms or phrases that convey similar meanings:
* Restless
* Fidgety
* Anxious
* Eager
* Hotheaded
* On edge
* Unable to wait
* Burning with anticipation
You can also use descriptive verbs to convey impatience, such as:
* Fretting
* Chafing
* Pacing
* Fuming
* Taping one's fingers
The best choice will depend on the specific context and the nuance you want to convey.