Translated as: "It's completely in the wrong direction!"

> てんで = Completely / At all
>
> 方向【ほうこう】 = direction
>
> ちがい = wrong
>
> じゃない = is not

I'm struggling with doble negatives in japanese. In my mind I'd translate this
as: "Is not the wrong direction at all!".

For the intended meaning, I wonder why is not correct to just say: てんで方向ちがいだ！

I'd understand that meaning if the ending was a question, as in:
てんで方向ちがいじゃないの？ , but this was not the case.
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2020-02-22T06:40:05.617
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2020-02-22T06:52:12.480
2020-02-22T06:52:12.480
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question
translation negation
てんで方向ちがいじゃない！ DB Chapter2 Double negatives