He lifted the boulder, but not without heavy exertion.
you can not win without exertion . Your highest exertion is required.
Strenuous is an adjective. Strenuous means requiring or using great exertion.
The base word of "strenuous" is "strength."
The workout was quite strenuous.
Strenuous describes hard and extended physical exertion or exercise.
The strenuous exercise made my muscles ache.
Too much strenuous exercise can result in jury.
give me the answer
"Illustrate" is a word that means to give an example or to make something clear by using examples.
Difficult, tedious, strenuous.
Endeavour
No, it's an adjective (word describing a noun)
Give me a sentence on word brood