Definitions of schizophrenic:

noun: someone who is afflicted with schizophrenia
adjective: suffering from some form of schizophrenia
Example: "Schizophrenic patients"
adjective: suffering from a form of schizophrenia characterized by foolish mannerisms and senseless laughter along with delusions and regressive behavior
adjective: of or relating to or characteristic of schizophrenia