What is a prefix for behave?

There isn't a single, universally accepted prefix for "behave". It depends on the context and what you want to convey. Here are some options, along with examples:

To indicate a way of behaving:

* Mis-: Misbehave (to act badly)

* Well-: Well-behaved (to act properly)

* Badly-: Badly-behaved (to act improperly)

* Properly-: Properly-behaved (to act appropriately)

* Rudely-: Rudely-behaved (to act rudely)

* Kindly-: Kindly-behaved (to act kindly)

* Politely-: Politely-behaved (to act politely)

* Aggressively-: Aggressively-behaved (to act aggressively)

* Passively-: Passively-behaved (to act passively)

To indicate a type of behavior:

* Self-: Self-behavior (behavior related to oneself)

* Social-: Social behavior (behavior in a group)

* Animal-: Animal behavior (behavior of animals)

* Human-: Human behavior (behavior of humans)

Other options:

* Re-: Re-behave (to behave again)

* Over-: Over-behave (to behave excessively)

* Un-: Un-behave (to not behave)

The best prefix will depend on the specific meaning you want to convey.

For example, if you want to describe someone who acts improperly, you could use "misbehave" or "badly-behaved." If you want to describe someone who acts politely, you could use "politely-behaved."