「難しい」 (Muzukashii) is an i-adjective meaning 'difficult' or 'hard'. It describes tasks, problems, or subjects that require a lot of effort, skill, or thought to understand or accomplish. It indicates a challenge or complexity.

「難(むずか)しい」は「difficult, hard」という意味(いみ)のい形容詞(けいようし)です。課題(かだい)や問題(もんだい)の難(むずか)しさを表(あらわ)します。