retard

1. V-T If something retards a process, or the development of something, it makes it happen more slowly. 阻碍; 减缓[正式]

Continuing violence will retard negotiations over the country's future. 持续不断的暴力活动会阻碍关于国家未来的谈判的进行。

2. N-COUNT If you describe someone as a retard, you mean that they have not developed normally, either mentally or socially. 笨蛋; 傻子[非正式，侮辱]