Grammar Info

N5 Lesson 4: 13/13

くない

Not (Adjective)

い-Adjectives, whether positive or negative, cannot be used with だ

Structure

[い]Adjective[く]+ ない

Examples:
おもしろ + ない
(あたら) + ない

Details

  • Part of Speech

    Adjective

  • Word Type

    Auxiliary Verb

  • Register

    Standard

  • 品詞

    形容詞

  • 単語の種類

    助動詞

  • 使用域

    一般

About い-Adjectives くない

The negative form of い-Adjectives in Japanese is created by using the conjunctive form of the adjective, followed by ない. conjunctive form just means 'agglutinative', or 'conjunctive' in Japanese. For い-Adjectives, this conjunctive form is created by removing い, and replacing it with く.
  • あなた(わる)ない
    You are not to blame. (Translates directly to, you are not bad.)
  • 今日(きょう)(あつ)ない
    It is not hot today.
The ない used with い-Adjectives is considered to be a different word to the ない used with verbs. When used with い-Adjectives, ない itself is also an い-Adjective. This means that it follows the same rules as regular い-Adjectives. Due to ません (the polite negative form) being an auxiliary verb, it cannot be conjugated with い-Adjectives in the same way as verbs.
  • この(ちゃ)(ぬる)くません。
    This tea don't lukewarm. (Incorrect example, with incorrect English to match!)
  • この(ちゃ)(ぬる)ありません
    This tea is not lukewarm. (Natural Japanese)
As can be seen here, you must first add the verb ある, and then conjugate it into its negative form using the auxiliary verb ません. This is how the polite negative is created.
Caution
As with regular い-Adjectives, you cannot use after ない. です is acceptable to create a semi-polite form, but is best used in spoken language only.

Examples

  • (あつ)ないです。((あつ)

    It is not hot.

  • 今日(きょう)(さむ)ない。((さむ)

    It is not cold today.

  • これ(たの)ないです。((たの)しい

    This is not fun.

  • (あたら)ないコンピューター。((あたら)しい

    A computer that is not new.

  • それ(やす)ないです。((やす)

    That is not cheap.

  • Get more example sentences!

    Premium users get access to 12 example sentences on all Grammar Points.

Self-Study Sentences

Study your own way!

Add sentences and study them alongside Bunpro sentences.

い-Adjectives くない – Grammar Discussion

    There's currently no discussion for い-Adjectives くない
    Ask questions and learn together with other Bunpro users!