What is じゃねぇか? What is its original form?


> 完成前とずいぶん色が違うじゃねぇか！

In this sentence, what is じゃねぇか?




じゃねぇか is just a colloquial form of the tag question じゃないか.




This doesn't only happen with じゃない > じゃねえ, but generally /ai/ > /ee/, like

> きたない > きたねえ  
>  やばい > やべえ  
>  (食{た}べたい = ) 食{く}いたい > 食いてえ

As in the other answer, this is extremely informal and in the wrong context
can easily be considered plain rude.

Xと違う = to differ from X  
完成前 = before completion

**Edit.** For completeness, there's also

  * /ae/ > /ee/  
e.g. お前 > おめえ

  * /oi/ > /ee/  
e.g. すごい > すげえ

  * /ui/ > /ii/  
e.g. さむい > さみい, まずい > まじい

