My best friend tells me that I am silly to be upset about this.

我最好的朋友说我要是为这事而沮丧难过就真够傻的。

You silly boy; why did you tramp about so long in the cold?.

你这个傻孩子，为什么大冷天走这么大老远的路？

I thought it would be silly to be too rude at that stage.

我原本觉得在那个时候太粗鲁会很愚蠢。

That's a silly question.

那是个愚蠢的问题。

...a silly hat.

可笑的帽子

Right now the poor old devil's drinking himself silly.

这会儿那可怜的老家伙又喝得糊里糊涂的了。

Poor Donald's been worrying himself silly.

可怜的唐纳德一直在杞人忧天。