What is prefix for to confident?

There isn't a single perfect prefix for "confident". It depends on the specific nuance you want to convey. Here are some options with their meanings:

General confidence:

* Over-confident: Too confident, arrogant

* Under-confident: Lacking confidence, timid

* Self-confident: Confident in oneself

* Highly-confident: Very confident

Other specific prefixes:

* Un-confident: Not confident, lacking assurance

* In-confident: Not confident, lacking self-belief

* Re-confident: Becoming confident again, regaining confidence

* Pre-confident: Feeling confident before an event

The best prefix will depend on the context of your sentence and the meaning you want to express.