What is a prefix for selfish?

There isn't a single, universally accepted prefix for "selfish". However, depending on the specific nuance you're trying to convey, you could use:

* Self- : This is the most straightforward option, as it directly refers to the individual. Example: "self-interest"

* Ego- : This prefix emphasizes the individual's self-importance and sense of superiority. Example: "egotistical"

* Narcis-: This prefix suggests a preoccupation with oneself and a lack of empathy for others. Example: "narcissistic"

The choice of prefix will depend on the specific context and the specific shade of meaning you wish to communicate.