Mental retardation has different levels. There is Mild intellectual disability; moderate intellectual disability; severe intellectual disability; and Profound intellectual disability.
https://www.floridahospital.com/mental-retardation-mr/symptoms-and-signs-mental-retardation
In about 35% of cases, the cause of mental retardation cannot be found.
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Pseudo-retardation would be something that resembles or looks like retardation, but actually isn't. The term literally means, fake retardation.
No a dimple is not a sign of retardation.
Retardation = change in vel / time taken
There are many causes of retardation. These includes Down syndrome, velocariofacial syndrome, fetal alcohol syndrome, problems during pregnancy and other genetic disorders.
Retardation - 2015 was released on: USA: 2015
Overstudy does not cause mental retardation.
Hyperthyroidism, whooping cough, chickenpox, measles, and Hib disease (a bacterial infection) may cause mental retardation if they are not treated adequately.
Many people use it pejoratively but it is not a swear word.
The first spelling is correct: "Retardation."
TThere are quite high as it comes in different types of mental retardation.