retard

Meanings

• a person of subnormal intelligence
• cause to move more slowly or operate at a slower rate
  • "This drug will retard your heart rate"
• be delayed
• slow the growth or development of
  • "The brain damage will retard the child's language development"
• lose velocity; move more slowly

Synonyms

changeling, check, cretin, decelerate, delay, half-wit, idiot, imbecile, moron, slow, slow down, slow up