い形容詞(〜いです / 〜くないです)
JLPT N5 Adjectivesi-adjectives: basic and negative forms
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I-adjectives end in i and can directly modify nouns or end a sentence with desu added for politeness. For the negative, drop the final i and add kunai desu: takai becomes takakunai desu. The adjective ii (good) is irregular and conjugates from yoi: yokunai.
Examples
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Kono heya wa hiroi desu.
This room is spacious.
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Kono mondai wa muzukashikunai desu.
This problem is not difficult.