「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(あたら)しい」は「new」という意(いみ)味(み)のい形(けい)容(よう)詞(し)です。新(あたら)しさや目(め)新(あたら)しさを表(ひょう)現(げん)します。