he·be·phre·ni·a 
(hē′bə-frēnē-ə, -frĕnē-)
(hē′bə-frēnē-ə, -frĕnē-)n.
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·phrenic (-frĕnĭk, -frēnĭk) adj.