If you fail, don't come snivelling.

如果你失败了，别哭哭啼啼来找我。

If you fail, do not come snivelling.

如果你失败了，可不要地回来找我。

Or painted a snivelling you bad boy!

不然把你画成一个哭鼻子的坏孩子！

You fail, don't come snivelling back to me.

如果你失败了，可不要啼啼地回来找我。

I had fallen into a chair, weakly snivelling.

我已经倒在了椅子上，颤抖着，抽泣着。