retard

延緩、阻礙、使減緩正式

Cold weather can retard the growth of these young plants.

寒冷的天氣會延緩這些幼苗的生長。

拖延、使落後正式

A lack of funding has retarded progress on the new bridge.

資金不足使新橋的工程進度嚴重落後。

智障、白痴貶義、侮辱性用語

Calling someone a retard is deeply offensive and should be avoided.

罵別人智障是極為侮辱人的說法，應該避免。