A rare grammatical term used in Japanese linguistics for words that function like adjectives but take the copula, often called 形容動詞 (keiyōdōshi) in traditional grammar. This term is mainly encountered in academic or linguistic contexts.
See also: 形容動詞
In Japanese language education, the term 形状詞 is sometimes used.
形状詞は、いわゆるナ形容詞とほぼ同じ品詞を指す。
形状詞 refers to roughly the same part of speech as so-called na-adjectives.
Compound of 形状 (keijō, 'form, shape') and 詞 (shi, 'word, part of speech'), likely coined in modern Japanese linguistics to describe words that take the form of adjectives but behave like nouns.