"one might say scizophrenic"   

But one would be much better not to.

The Guardian style guide entry on the use and misuse of this term surely gets it right: "use only in a medical context, never to mean "in two minds", contradictory, or erratic, which is wrong, as well as offensive to people diagnosed with this illness; schizophrenic should never be used as a noun. It is a medical term for a terrible condition."