"retarded" in the noun sense
1. mentally retarded, retarded, developmentally challenged
people collectively who are mentally retarded
"he started a school for the retarded"
"retarded" in the verb sense
cause to move more slowly or operate at a slower rate
"This drug will retard your heart rate"
3. check, retard, delay
slow the growth or development of
"The brain damage will retard the child's language development"
4. decelerate, slow, slow down, slow up, retard
lose velocity move more slowly
"The car decelerated"
"retarded" in the adjective sense
relatively slow in mental or emotional or physical development
"providing a secure and sometimes happy life for the retarded"
Source: WordNet® (An amazing lexical database of English)
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