also sub-normal
If someone is ~, they have less ability or intelligence than a normal person of their age. (OLD-FASHIONED)
...educationally ~ children.
ADJ
•
The ~ are people who are ~.
She attended a school for the educationally ~.
N-PLURAL: the N
SUBNORMAL
Meaning of SUBNORMAL in English
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012