amentia
noun
amen·tia (ˌ)ā-ˈmen(t)-sh(ē-)ə 
(ˌ)ä-
dated
: intellectual disability
Word History
Etymology
New Latin, from Latin, madness, from ament-, amens mad, from a- (from ab-) + ment-, mens mind — more at mind
First Known Use
1793, in the meaning defined above
Medical Definition
amentia
noun
amen·tia (ˈ)ā-ˈmen-ch(ē-)ə (ˈ)ä-
(ˈ)ä- dated
: intellectual disability