Japanese grammar

What does ~ではあるまいし mean? Japanese grammar N1

~ではあるまいし means it is not as though… so….

Quick facts
Level (estimated, JLPT framework)N1
StructureN + ではあるまいし
Romajidehaarumaishi
Meaningit is not as though… so…

Forming it

ConnectionN + ではあるまいし

How to use it

Rejecting an excuse: “it's not even N, so...”. Colloquial, with a slightly sharp or reproachful tone.

  • 「Nではあるまいし」 = it's not even N (so don't...). The latter clause is advice, a command, or criticism: 「子どもではあるまいし、自分で決めなさい」.
  • 「あるまい」 is the classical negative conjecture form of 「ある」 — the whole phrase means “surely it isn't N”.
  • The quick spoken form is 「じゃあるまいし」. Not used in formal writing, since the tone is fairly blunt.

Examples

  • You are not a child, so decide for yourself.

  • It is not your first time, so you need not be so nervous.

Keep in mind

  • Fixed expression: 「ではあるまいし」, not 「ではないまいし」.
  • The following clause must be advice/reproach, not a neutral description.

Common mistakes

  • Wrong子(こ)どもではないまいし。

    Correct子(こ)どもではあるまいし。

    The fixed phrase is ではあるまいし.

Exam tips

  • 「ではあるまいし」 = it's not even N (so...); the latter clause is advice/reproach, colloquial.

Related patterns

All N1 grammar →