He was not the kidney that burns out in a few years of strenuosity, but a man with a mind of steel and a body of whipcord, and now his eyes were lined and ringed as they should not have been until his hair had turned white.
"The Tempering"
Charles Neville Buck
The world began again-polished manners and social order gave place to strenuosity and individualism.
"Women of Early Christianity Woman: In all ages and in all countries, Vol. 3 (of 10)"
Alfred Brittain Mitchell Carroll
He put a curb on strenuosity; started to study the French temperament; he began to see why he had not succeeded.
"The War After the War"
Isaac Frederick Marcosson