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 (hē′bə-frē′nē-ə, -frĕn′ē-)
A type of schizophrenia characterized by disorganized speech and behavior, flat or inappropriate affect, and sometimes silly or inappropriate mannerisms. Also called disorganized schizophrenia.

[Greek hēbē, youth (because the onset of the disorder typically occurs in adolescence or young adulthood) + -phrenia.]

he′be·phren′ic (-frĕn′ĭk, -frē′nĭk) adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.hebephrenic - suffering from a form of schizophrenia characterized by foolish mannerisms and senseless laughter along with delusions and regressive behavior
insane - afflicted with or characteristic of mental derangement; "was declared insane"; "insane laughter"