Mental retardation and Mental deficiency

Mental retardation

Mental retardation noun - Lack of normal development of intellectual capacities.

Mental deficiency and mental retardation are semantically related in mental handicap topic. In some cases you can use "Mental deficiency" instead a noun phrase "Mental retardation".

Mental deficiency

Mental deficiency noun - Mild mental retardation.

Mental retardation and mental deficiency are semantically related in underdevelopment topic. You can use "Mental retardation" instead a noun phrase "Mental deficiency".
Cite this Source
Mental deficiency and Mental retardation. (2016). Retrieved 2026, August 02, from https://thesaurus.plus/related/mental_retardation/mental_deficiency
Mental retardation & Mental deficiency. N.p., 2016. Web. 02 Aug. 2026. <https://thesaurus.plus/related/mental_retardation/mental_deficiency>.
Mental deficiency or Mental retardation. 2016. Accessed August 02, 2026. https://thesaurus.plus/related/mental_retardation/mental_deficiency.
Google Ngram Viewer shows how "mental retardation" and "mental deficiency" have occurred on timeline