Definitions of retard on the Web:
check: slow the growth or development of; "The brain damage will retard the child's language development"
cause to move more slowly or operate at a slower rate; "This drug will retard your heart rate"
be delayed
idiot: a person of subnormal intelligence
decelerate: lose velocity; move more slowly; "The car decelerated"
wordnet.princeton.edu/perl/webwn
Mental retardation (also called mental handicap and the UK Mental Health Act (1983) defines mental impairment and severe mental impairment) is a term for a pattern of persistently slow learning of basic motor and language skills ("milestones") during childhood, and a significantly below-normal global intellectual capacity as an adult. One common criterion for diagnosis of mental retardation is a tested intelligence quotient (IQ) below 70.
en.wikipedia.org/wiki/Retard
Signs
There are many signs. For example, children with developmental disabilities may learn to sit up, to crawl, or to walk later than other children, or they may learn to talk later. Both adults and children with intellectual disabilities may also:
have trouble speaking
find it hard to remember things
have trouble understanding social rules
have trouble discerning cause and effect
have trouble solving problems
have trouble thinking logically.
Profound mental retardation Below 20
Severe mental retardation 20–34
Moderate mental retardation 35–49
Mild mental retardation 50–69
Borderline mental retardation 70–79
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