blunder

a thundering fool [mistake]

大傻瓜 [大错特错]

Both of these positions are erroneous.

这两个意见都大错特错。

but you see he is quite wrong!

但你看见了，他大错特错

His idea is completely off base.

他的想法大错特错。

He is badly out in his calculations.

他的计算结果大错特错。

His answer was wildly wrong.

他的回答大错特错。

Your calculation is way off beam.

你的计算大错特错.

How wrong we are!

我们是大错特错了！

The wrong is too great to be redressed.

大错特错以致无法补救。

I' m afraid it' s all a dreadful mistake.

看来全都大错特错了.

Most times they're dead wrong.

可是大部分时间他们却大错特错。

If you think that, you're barking up the wrong tree altogether.

你要是那样想, 你就大错特错了.

If you think that, you are gravely mistaken.

你若是那样想, 就大错特错了.

If you think that, you are barking up the wrong tree altogether .

你要是那样想，你就大错特错了。

If you think that, you are grievously in error.

你要是那样想, 你可就大错特错了.

Such a conclusion would be wrong on pretty much every count

然而这样一个结论完全是大错特错的。

They mistake grossly in thinking that might is right.

他们以为强权即公理，那是大错特错了。

I proved wildly off the mark.

而事实证明，我是大错特错了。