noun Psychiatry.
a type of schizophrenia characterized by emotionless, incongruous, or silly behavior, intellectual deterioration, and hallucinations, frequently beginning insidiously during adolescence.

1880–85; < Greek hēbē- (see hebetic) + -phrenia

hebephrenic [hee-buh-fren-ik] , adjective
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World English Dictionary
hebephrenia (ˌhiːbɪˈfriːnɪə)
a form of pubertal schizophrenia, characterized by hallucinations, delusions, foolish behaviour, and senseless laughter
[C20: New Latin, from Greek hēbē youth + -phrenia mental disorder, from phrēn mind]

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Medical Dictionary

hebephrenia he·be·phre·ni·a (hē'bə-frē'nē-ə, -frěn'ē-ə)
A schizophrenia, usually starting at puberty, characterized by foolish mannerisms, senseless laughter, delusions, hallucinations, and regressive behavior. Also called disorganized schizophrenia, hebephrenic schizophrenia.

he'be·phren'ic (-frěn'ĭk, -frē'nĭk) adj.
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