1. A job, assignment, or piece of work that is challenging, demanding, or hard to accomplish
Learning a new language is a difficult task.
Aprender uma nova língua é uma tarefa difícil.
2. An undertaking that requires significant effort, skill, or time to complete successfully
Finishing the project on time proved to be a difficult task.
Terminar o projeto no prazo mostrou-se uma tarefa difícil.