noun
difficult role; tough part
Refers to a challenging role or part, especially in acting, theater, or a figurative task.
彼は今回の舞台で難役を演じることになった。
He ended up playing a difficult role in this stage production.
新入社員にとって、このプロジェクトのリーダーは難役だ。
For a new employee, being the leader of this project is a tough role.