retarded

(noun) people collectively who are mentally retarded. Synonyms: mentally retarded, developmentally challenged. Example: "He started a school for the retarded."

(verb) cause to move more slowly or operate at a slower rate. Synonyms: retard. Example: "This drug will retard your heart rate."

(verb) be delayed. Synonyms: retard.

(verb) slow the growth or development of. Synonyms: check, retard, delay. Example: "The brain damage will retard the child's language development."

(verb) lose velocity; move more slowly. Synonyms: decelerate, slow, slow down, slow up, retard. Example: "The car decelerated."

(adj) relatively slow in mental or emotional or physical development. Synonyms: retarded (vs. precocious). Example: "Providing a secure and sometimes happy life for the retarded."