Structure
Noun + じゃある(1) + まいし
Verb + ん + じゃある(1) + まいし
Verb + わけ + じゃある(1) + まいし
(1) ではある、でもある
Details
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Standard
About じゃあるまいし
じゃ or ではあるまいし is an expression which can be translated in a similar way to 'it is not (A), so it is not (B)', or 'you are not (A), so you can't (B)', and is often used for criticism of something acting in a way that is not befitting of it.
まい is an auxiliary verb which highlights negative-volitional statements. This means that it has a similar meaning to ないだろう. Due to this, the combination of では, the う-Verb ある 'to be', まい 'not as if', and し, the particle that highlights reasons, all combine to have a literal meaning of 'it is not as if it's (A), so therefore (B)'.
じゃあるまいし will be used after nouns, or phrases that have been nominalized with something like の.
The statement that follows じゃあるまいし will state the speaker's opinion in relation to (A), and will almost always be negative.
Examples
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減るもんじゃあるまいし車を貸してくれ。
You are notgoing to lose out or anything, so lend me your car, man.
子供じゃあるまいしお菓子を見つけた途端に全部食べるな!
You are not a child, so don't instantly eat every sweet you stumble upon!
アニメじゃあるまいし、かわいい女の子は急に空から落ちてこない。
This is not an anime, so a cute girl won't suddenly fall out of the sky!
田中さん!新入社員でもあるまいし!そんな簡単なミスはすべきじゃないよ。
Tanaka-san! You are not a new employee, so you should not make such simple mistakes.
お父さん、結婚するわけじゃあるまいし、ただの学校のパーティーだよ。泣かないで。
Papa, I am not getting married. It is just a school party, so please don't cry!
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Online
接続・意味・使い方
日本語教師のN1et
Breakdown and examples
JapaneseTest4You
接続・意味・使い方・例文
にほんごの里
Offline
Tae Kim's Japanese Grammar Guide
Page 337
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