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1. A person of subnormal intelligence
   - idiot, imbecile [informal], moron [informal], changeling [archaic], half-wit [informal], eejit [UK, Ireland, dialect], plank [Brit, informal], thickie [Brit, informal], thicko [informal]

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

Derived forms: retarded, retarding, retards

See also: dolt [informal], dullard, meatball [N. Amer, informal], pillock [Brit, informal], pudden-head [US, informal], pudding head [informal], stupe [N. Amer, informal], stupid, stupid person

Type of: alter, be, change, decelerate, decrease, diminish, fall, lessen, modify, simple [archaic], simpleton, slow down

Encyclopedia: Retard