1. A difficult, laborious, or burdensome task that causes hardship or suffering
Cleaning the attic was a tedious and arduous task.
Limpar o sótão foi uma tarefa penosa e cansativa.
2. Work that is painful, exhausting, or distressing to perform
Writing the final report proved to be an arduous task for the team.
Escrever o relatório final provou ser uma tarefa penosa para a equipe.