ク活用

From く (-ku, the 未然形 (mizenkei, “incomplete form”) and 連用形 (ren'yōkei, “stem form”) of adjectival suffix し (-shi)) +‎ 活用 (katsuyō, “declension, inflection”).

• (Tokyo) くかつよー (Nakadaka – )
• IPA^(key):

ク活用(かつよう) • (ku katsuyō) ^{←くくわつよう (kukwatuyou)?}

1. (Classical Japanese grammar) an adjective inflection class for some classical adjectives ending in -shi:

The subscripts in the table above indicate differences in vowel class that were already being lost in Old Japanese. It remains unclear what those different vowel classes may have meant. See the Syllables section in the Wikipedia article on Old Japanese for more details.

• Adjectives in this class are often related to objective properties or status, as opposed to adjectives of the シク活用 (shiku katsuyō) class.
• Adjectives in this class are superseded by the い (-i) inflection in modern Japanese:

  清(きよ)し (kiyoshi) → 清(きよ)き (kiyoki) → 清(きよ)い (kiyoi)

  高(たか)し (takashi) → 高(たか)き (takaki)→ 高(たか)い (takai)

  良(よ)し (yoshi) → 良(よ)き (yoki) → 良(よ)い (yoi)

• シク活用(かつよう) (shiku katsuyō)
• タリ活(かつ)用(よう) (tari katsuyō)
• ナリ活(かつ)用(よう) (nari katsuyō)