欠けつ如じょ動どう詞し

noun

defective verb

A grammatical term for a verb that lacks some of the normal conjugational forms, such as ある in modern Japanese which has no plain negative form (*あらない).

• 現げん代だい日本にほん語ごの「ある」は欠けつ如じょ動どう詞しの一いち例れいで、否ひ定てい形けいは「ない」で代だい用ようされる。

  Modern Japanese 'aru' is an example of a defective verb; its negative form is supplied by 'nai'.