strenuous
adjectiveUK /ˈstrenjuəs/
US /ˈstrenjuəs/
Needing a lot of hard work and energy.
The hike up the mountain was strenuous.
SYNONYMS
OTHER MEANINGS
2. Very active and full of energy.
She made a strenuous effort to finish the race.
3. Requiring great care and strong effort to do.
The lawyer made a strenuous argument in court.
4. Putting a lot of physical strain on the body.
Lifting heavy boxes is strenuous work.