retard retard /riːˈtɑːrd/

noun

1. [Offensive] A person of subnormal intelligence  ( changeling [Archaic] , cretin [Offensive] , half-wit [Informal] , imbecile [Informal] , moron [Informal] , retard [Offensive] , eejit [Dialect, UK, Irish] , thickie [Informal, British] , thicko [Informal] , idiot )
   a person of subnormal intelligence
     The town considered him an idiot due to his foolish and nonsensical behavior.
   The town considered him an idiot due to his foolish and nonsensical behavior.
   

verb

1. () Cause to move more slowly or operate at a slower rate  ( retard )
   cause to move more slowly or operate at a slower rate
    This drug will retard your heart rate
   This drug will retard your heart rate
   
2. Lose velocity; move more slowly  ( retard , slow up , decelerate , slow , slow down )
   lose velocity; move more slowly
    The car decelerated
   The car decelerated
   
3. Slow the growth or development of  ( delay , retard , check )
   slow the growth or development of
    The brain damage will retard the child's language development
   The brain damage will retard the child's language development
   
4. Be delayed  ( retard )
   be delayed