noun
A Japanese part of speech that behaves like a noun but functions adjectivally with な or の. In traditional Japanese grammar, it includes ナリ活用 and タリ活用 types. Often called 'na-adjective' in learner materials.
「静か」は形容動詞の典型的な例です。
"Shizuka" is a typical example of an adjectival noun.
In Japanese language education, adjectival nouns are often called "na-adjectives."