シク活用

From しく (-shiku, variant 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) しくかつよー (Nakadaka – )^[1]
• IPA^(key):

シク活用(かつよう) • (shiku katsuyō) ^{←しくくわつよう (sikukwatuyou)?}

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 emotions or feelings, as opposed to adjectives of the ク活用 (ku katsuyō) class.
• Adjectives in this class are superseded by the しい (-shii) inflection in modern Japanese:

  嬉(うれ)し (ureshi) → 嬉(うれ)しき (ureshiki) → 嬉(うれ)しい (ureshii)

  恋(こひ)し (koishi) → 恋(こひ)しき (koishiki) → 恋(こい)しい (koishii)

  可笑(をか)し (okashi) → 可笑(をか)しき (okashiki) → 可笑(おか)しい (okashii)

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