「低い」 (Hikui) is an i-adjective meaning 'low'. It describes something that is not high in position, level, or sound. It indicates a small vertical distance or a less intense degree, often as the opposite of '高い'.

「低(ひく)い」は「low」という意味(いみ)のい形容詞(けいようし)です。高(たか)さやレベルが低(ひく)いことを表(あらわ)します。