「新しい」 (Atarashii) is an i-adjective meaning 'new'. You use it to describe things that have just been made, recently acquired, or are unfamiliar. It signifies novelty, whether it's a new book, a new car, or a new idea.

「新しい」は「new」という意味のい形容詞です。新しさや目新しさを表現します。