わけない (wake nai): No way, the colloquial form
～わけない (wake nai)
Meaning
There is no way that (colloquial わけがない)
Formation and usage
Plain-form verb or i-adjective + わけない; noun/na-adjective + な + わけない. This is colloquial わけがない with が omitted.
Explanation
In this entry, wake nai is the colloquial form of wake ga nai with ga omitted. It strongly rejects a possibility based on reasoning. Distinguish it from the separate adjective 訳ない meaning easy, as in sonna no wake nai.
Examples
彼は今海外にいるから、今日ここに来るわけないよ。
He is abroad now, so there is no way he will come here today.
鍵がかかっているんだから、誰でも入れるわけない。
It is locked, so there is no way just anyone can get in.
一度も習っていないのに、急にできるわけないよ。
You have never learned it, so there is no way you can suddenly do it.
こんな小さな箱に、全部入るわけないでしょう。
There is no way everything will fit in such a small box.
朝から何も食べていないんだから、お腹がすかないわけないよ。
You have eaten nothing since morning, so there is no way you are not hungry.
How related patterns differ
わけではない and わけでもない reject an interpretation or generalization. わけがない strongly rules out a possibility; わけない is its colloquial form. わけだ presents a logical conclusion, while わけにはいかない concerns duties or principles that prevent an action.