I recently noticed in passing that 湿気る is classified as both a godan and an ichidan verb.
For example, the past tense could be either:

しけった (godan)


しけた  (ichidan).

This strikes me as being fairly unusual. Offhand, I can't think of any other verbs that have this feature. Perhaps someone knows other verbs which are classified as both godan and ichidan? Maybe someone even knows why...

  • しけった -- ん? 「しけた」「しっけた」って言うけど。。 「しける」「しっける」やし。。あれ?私だけ?
    – chocolate
    Commented Oct 27, 2018 at 15:18
  • The dictionary has 3 forms. weblio.jp/content/%E6%B9%BF%E6%B0%97%E3%82%8B
    – Leebo
    Commented Oct 27, 2018 at 15:19
  • @Chocolate ah you're correct I think. I will edit that.
    – kandyman
    Commented Oct 27, 2018 at 15:20
  • Now with the edit you have the two ichidan forms represented, but not the 3rd godan form. I think Chocolate is just saying that people don't say the godan version much.
    – Leebo
    Commented Oct 27, 2018 at 15:22
  • 1
    @Leebo 「しっけてる」「しけってる」両方とも聞くような気がします・・
    – chocolate
    Commented Oct 27, 2018 at 15:44

1 Answer 1


I know this is not an optimal method, but I did a full text search on デジタル大辞泉 with 五段化, and found the following examples of ichidan-to-godan change.

  • 湿気る: 下一段動詞「しけ(湿気)る」の五段化。
  • 下さる: 《動詞「くだされる」(下一)の五段化》
  • 抉る: 《「こじる」(上一)の五段化》
  • 遣わさる: [動ラ五(四)]「つかわされる」(下一段)の五段化。

下さる and 抉る are always godan in modern Japanese. I didn't know 遣わさ(れ)る can conjugate as a godan verb. I did a similar search on 明鏡国語辞典 and 湿気る was the only verb with the remark "五段にも活用". So I think 湿気る is a rare example of verbs that are both fully godan and fully ichidan in modern Japanese.

FWIW, I think I usually use the godan version of 湿気る. Most similar slangy verbs made from an on-yomi noun usually conjugate as a godan verb (駄弁る, 事故る, 愚痴る, ...), so the ichidan version may become less popular in the far future. This question may be related.

  • 五段「しける」が「しけらない、しけります、しける、しければ、しけった」、下一段「しける」が「しけない、しけます、しける、しければ、しけた」、下一段「しっける」が「しっけない、しっけます、しっける、しっければ、しっけた」← あってます?  あれ?「しっけらない、しっけります」ってのもあります? おかしい?
    – chocolate
    Commented Oct 28, 2018 at 3:35
  • 1
    – naruto
    Commented Oct 28, 2018 at 6:44

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