This phrase means "it's not like..." or "you're not a..." You use it to show you are annoyed. You think someone is acting wrongly for who they are.
Noun + でもあるまいしPrimary
な-Adjective + でもあるまいし
This phrase means "it's not like..." or "you're not a..." You use it to show you are annoyed. You think someone is acting wrongly for who they are.
そんなに怒るなんて大人げないよ。子供でもあるまいし。
Getting that angry is childish. It's not like you're a child.
神様でもあるまいし、未来のことなんて分かるわけがない。
It's not as if I'm a god; there's no way I can know the future.
初めてのデートでもあるまいし、そんなに緊張しなくてもいいのに。
It's not your first date, so you don't have to be so nervous.
プロの料理人でもあるまいし、少しぐらい失敗したっていいじゃないか。
You're not a professional chef, so it's okay if you mess up a little, isn't it?
ここは戦場でもあるまいし、もっと落ち着いて話しましょう。
This isn't a battlefield, so let's speak more calmly.
This is like saying "you are not even..." It is stronger than "〜ではあるまいし" or "〜じゃあるまいし." It shows more anger or frustration. "〜ではあるまいし" is normal. "〜じゃあるまいし" is casual. This form is the strongest of the three.
Don't use this when talking about verbs or い-adjectives. For example, you cannot say "食べるでもあるまいし" (taberu demo nai shi).
Use this when you want to tell someone they are wrong. You are saying their actions do not make sense. You are also saying there are other reasons why they are wrong.
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