Levin, looking at the tiny, pitiful creature, made strenuous efforts to discover in his heart some traces of fatherly feeling for it.
It is true that in the cattle-yard things went no better than before, and Ivan strenuously opposed warm housing for the cows and butter made of fresh cream, affirming that cows require less food if kept cold, and that butter is more profitable made from sour cream, and he asked for wages just as under the old system, and took not the slightest interest in the fact that the money he received was not wages but an advance out of his future share in the profits.
There are no more uses of "strenuous" in the book.
Show samples from other sources
The doctor recommended strenuous exercise three times a week.
Landscaping is strenuous work in the Texas summer.