Jisho

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Noun
1. adjectival noun (in Japanese); quasi-adjective; nominal adjective; na-, taru-, nari- or tari-adjectiveGrammar
Wikipedia definition
2. Adjectival noun (Japanese)An adjectival noun or sometimes just adjectival is a noun that functions as an adjective by taking the particle 〜な -na (regular nouns can function adjectivally by taking the particle 〜の -no, which is analyzed as the genitive case). This term is often used in analyses of the Japanese language to refer to members of the word class commonly known as "na-adjectives".
Read “Adjectival noun (Japanese)” on English Wikipedia
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