It may also refer to people that are unable to think in an abstract/correct way because of other reasons, such as lack of education, but this usage is less frequent. <a href="http://buscon.rae.es/draeI/SrvltConsulta?TIPO_BUS=3&LEMA=anormal(3rd">http://buscon.rae.es/draeI/SrvltConsulta?TIPO_BUS=3&LEMA=anormal(3rd</a> acception)Anormal is by no means a neutral word, it is sensibly rejected by associations and relatives of people affected by Down syndrome and other illnesses.