じゃないか

じゃないか
expression
isn't it?; right?; tag-question ending
informalgrammatical
1. isn't it?; right?; ...aren't you?
A casual sentence-ending expression that seeks the listener's agreement or points out something the speaker thinks is obvious. A contraction of ではないか. Often also expresses mild surprise or a sudden realization.
いいじゃないか。
That's fine, isn't it?
君(きみ)にもできるじゃないか。
You can do it too, can't you?
もう時間(じかん)がないじゃないか、早(はや)く行(い)こう。
We're out of time, aren't we? Let's hurry.

A casual tag-question ending contracted from ではないか. It attaches to plain forms and invites agreement ("..., right?") or gently insists on something the speaker sees as obvious. With rising or exclamatory intonation it can also mark a sudden discovery ("Why, you can do it!").

Common patterns

  • いいじゃないか: that's fine, isn't it?
  • できるじゃないか: you can do it, can't you!
  • 言(い)ったじゃないか: I told you, didn't I?

Similar words

  • じゃん: more clipped, breezy casual equivalent (Kanto/Tokyo)
  • ではないか: the full, more formal or literary form
  • ね: softer; simply seeks confirmation without the insistent nuance

Related Words

Related: じゃん (casual contraction of じゃないか)
Compare: ではないか (the full, more formal or literary form)
Compare: やん (isn't it?)
Related: じゃんか (isn't it?)
general
Added 2026.7.7 6:18 · Revised 2026.9.2 13:02
29500/29707_janaika