According to general opinion, mental deficiency is a disease, and although the idea of disease is very vague, we are inclined to fall in with this general opinion.
See "Some Problems relating to the Detection of Border-line Cases of Mental Deficiency," by Lewis M.
They have no diagnostic significance except in so far as they are indications of mental deficiency.
In some countries three years' retardation is regarded as primâ facie evidence of mental deficiency.
Inheritance Not a Factor in Some Cases of Mental Deficiency.
In general there is more doubt about the inheritability of some of the insanities than about cases of mental deficiency.
Taking insane and mentally defective prisoners together, their number is small relative to that of those who suffer from no mental deficiency.
Just as some degree of mental deficiency is not incompatible with the ability to live a peaceable and useful life, physical defects do not necessarily unfit a man to discharge his duties as a citizen.
About two-thirds of mental deficiency is definitely inherited, about one-third acquired.
The cretin is the classic type of mental deficiency due to endocrine insufficiency, curable or improvable by the proper handling.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "mental deficiency" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
