Main Entry: he·be·phre·nia

Pronunciation: \ˌhē-bə-ˈfrē-nē-ə, -ˈfre-nē-\

Function: noun

Etymology: New Latin, irregular from Greek hēbētēs young adult (from hēbē youth) + English -phrenia; from the childish behavior which is often found with it

Date: 1883

: a form of schizophrenia characterized especially by incoherence, delusions lacking an underlying theme, and affect that is usually flat, inappropriate, or silly

— he·be·phre·nic \-ˈfre-nik, -ˈfrē-nik\ adjective or noun