Japanese grammar

What does ~なくはない mean? Japanese grammar N1

~なくはない means not that it isn't…; can't say it doesn't….

Quick facts
Level (estimated, JLPT framework)N1
StructureVない形 (drop い) + くはない
い形 くない → くなくはない
Romajinakuhanai
Meaningnot that it isn't…; can't say it doesn't…

Forming it

Verb分から + なくはない
i-adjective難しく + なくはない

How to use it

A CAUTIOUS affirmation via double negation; leaves a possibility open.

  • 「~なくはない」 = a double negative → a cautious affirmation: “it's not that it's not...”, i.e. partly true.
  • Used when wanting to admit part of something without fully committing.
  • Close to 「~ないものでもない」 (more formal) and 「~ないこともない」 (more colloquial).

Examples

  • It’s not that I don’t understand how he feels.

  • Depending on the terms, I wouldn’t necessarily refuse.

Keep in mind

  • Double negation = a cautious affirmation.
  • Not used when wanting a firm, definitive statement.

Common mistakes

  • Wrong必(かなら)ず分(わ)からなくはない。

    Well, it's not that I don't understand.

    Correctまあ、分(わ)からなくはない。

    This pattern is a CAUTIOUS affirmation, which contradicts 「必ず」.

  • Wrong分(わ)かるはない。

    It's not that I don't understand.

    Correct分(わ)からなくはない。

    The structure needs the NEGATIVE form before adding 「はない」.

Exam tips

  • 「なくはない」 = it's not entirely not... (a cautious affirmation, double negation).

Related patterns

All N1 grammar →