["~not" for Adjectives くない/じゃない] You can learn also conjugated form of adjectives and their meanings

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危険な（形容詞）

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37 NA Adjectives (な形容詞) in Japanese!(JLPT N5~N4 level)

Change Nouns into Adjectives & Adjectives into Adverbs with these techniques #Noun_to_adjective

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Word Formation | Forming Adjectives | Adjective Suffixes |Formation of Adjectives by Adding Suffixes