Synonyms for Schizophrenic (same or very similar meaning)
WordNet sense 1 (of or relating to or characteristic of schizophrenia):
schizoid
WordNet sense 2 (suffering from a form of schizophrenia characterized by foolish mannerisms and senseless laughter along with delusions and regressive behavior):
hebephrenic
WordNet sense 3 (afflicted with or characteristic of mental derangement):
insane
From the ODE community, based on WordNet
add/edit