You use this to say someone or something is not acting like they should. It means "it's not as if..." or "you're not...".
Noun + じゃあるまいしPrimary
な-Adjective + じゃあるまいし
You use this to say someone or something is not acting like they should. It means "it's not as if..." or "you're not...".
子供じゃあるまいし、いつまでも泣いているんじゃない。
You're not a child, so don't keep crying forever.
神様じゃあるまいし、未来のことなんて分かりませんよ。
It's not as if I'm a god, so of course I don't know what the future holds.
昔の恋人じゃあるまいし、どうしてそんなに彼のことを気にしたの？
He's not your old boyfriend, so why were you so concerned about him?
ここは戦場じゃあるまいし、もっと穏やかに話しましょう。
This isn't a battlefield, let's talk more calmly.
A:「彼、また同じミスを？」 B:「ええ。新人じゃあるまいし。」
A: "He made the same mistake again?" B: "Yes. And it's not as if he's a rookie anymore."
This word makes your reason stronger. It hints there are more reasons you are not saying. It can show you are a little annoyed.
This phrase is like saying "it's not as if..." It is a casual way to speak. The phrase 〜ではあるまいし is more formal. You can use it in writing too. 〜じゃあるまいし is not as rough as 〜じゃねえし. That one is very strong and more for men.
Use this when you want to criticize someone. You say they are acting like something they are not. This shows their behavior is wrong. Then you can tell them what to do.
Less formal alternatives(1)
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