mental defectiveness

Also found in: Thesaurus.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.mental defectiveness - retardation sufficient to fall outside the normal range of intelligence
backwardness, mental retardation, subnormality, slowness, retardation - lack of normal development of intellectual capacities
feeblemindedness - severe mental deficiency
References in periodicals archive ?
mental defectiveness hot amounting to idiocy, yet so pronounced that they are incapable of managing themselves or their affairs, or, in the case of children, being taught to do so;
mental defectiveness not amounting to imbecility, yet so pronounced that they require care, supervision and control for their own protection or the protection of others .
The class "moral imbecile" was replaced by "moral defective" which was defined as "persons in whose case there exists mental defectiveness coupled with strongly vicious or criminal propensities and who require supervision and control for the protection of others.