ではあるまいか

The expression ではあるまいか is a formal, literary way of expressing a conjecture or rhetorical question, meaning "isn't it…?", "I wonder if it isn't…", or "could it be that…?". It is used when the speaker strongly suspects or believes something to be the case, while phrasing it as a tentative question. The tone is reflective and deliberate, often found in written language such as essays, editorials, speeches, and literary works.

Structure

ではあるまいか attaches to nouns, na-adjectives, and nominalized clauses:

• Noun + ではあるまいか

  これこそほんとう本当のしあわせ幸せではあるまいか。

  Isn't this true happiness?

• Na-adjective + なの + ではあるまいか

  このもんだい問題はもっとしんこく深刻なのではあるまいか。

  Isn't this problem more serious (than we think)?

• Verb (plain form) + の + ではあるまいか

  かれ彼はなんか何かをかくしている隠しているのではあるまいか。

  Could it be that he is hiding something?

• i-adjective + の + ではあるまいか

  そのほうほう方法はあぶない危ないのではあるまいか。

  Isn't that method dangerous?

Nuance

Unlike a simple question, ではあるまいか carries a strong implication that the speaker already leans toward believing the proposition is true. It is used to present one's opinion or suspicion in a rhetorically softened way, inviting the listener or reader to consider the possibility. This makes it a common device in persuasive or contemplative writing.

Related forms

• ではないか / じゃないか – the everyday equivalent meaning "isn't it?" Used much more broadly in casual and polite conversation.
• ではなかろうか – another literary/formal variant with a similar meaning, using the classical negative conjecture form of ある.
• のではあるまいか – frequently appears with the nominalizer の when following verbs and adjectives, adding an explanatory nuance.

あるまい is the classical/literary negative volitional form of ある, meaning "probably is not" or "would not be." Combined with the question particle か, it creates a rhetorical double negative: "would it not be…?" → "surely it is…"