1. requiring or using great effort and energy; physically demanding
The hike was strenuous and took several hours to complete.
A caminhada foi extenuante e levou várias horas para ser concluída.
2. involving great effort, determination, or vigor
He made strenuous efforts to improve his grades.
Ele fez esforços extenuantes para melhorar suas notas.
3. very active, energetic, and vigorous
She leads a strenuous lifestyle with daily exercise and work.
Ela leva um estilo de vida extenuante com exercício e trabalho diários.