— hebephrenic /hee'beuh fren"ik/ , adj.
/hee'beuh free"nee euh/ , n. Psychiatry.
a type of schizophrenia characterized by emotionless, incongruous, or silly behavior, intellectual deterioration, and hallucinations, frequently beginning insidiously during adolescence.
[ 1880-85; hebe- (see HEBETIC) + -PHRENIA ]