「美味しい」 (Oishii) is an i-adjective meaning 'delicious' or 'tasty'. It's used to describe food or drink that has a pleasant flavor and is enjoyable to eat or drink. It's a common and positive way to compliment food.

「美味しい」は「delicious, tasty」という意味のい形容詞です。食べ物や飲み物の味がいいことを表します。