Indicating lack or imperfection:
* Im-: imperfect (lacking perfection)
* In-: inperfect (not perfect, but this is rarely used)
* Dis-: disperfect (not perfect, also rarely used)
* Un-: unperfect (not perfect)
Indicating excess or surpassing perfection:
* Super-: superperfect (exceeding perfection)
* Hyper-: hyperperfect (excessively perfect)
Indicating a specific aspect of perfection:
* Auto-: autoperfect (self-perfecting)
* Tele-: teleperfect (perfectly communicated at a distance)
* Omni-: omniperfect (perfect in all aspects)
The best prefix to use depends on the specific meaning you want to convey.