Слово "harden". Англо-русский словарь Мюллера

And in the general hardening of outlook that set in round about 1930, practices which had been long abandoned, in some cases for hundreds of years--imprisonment without trial, the use of war prisoners as slaves, public executions, torture to extract confessions, the use of hostages, and the deportation of whole populations--not only became common again, but were tolerated and even defended by people who considered themselves enlightened and progressive.

There’s no more hardened fool nor more inane

I hardened my heart, and took the smoke-rocket from under my ulster.

Waldron, though a hardened lecturer and a strong man, became rattled.

It had never before occurred to him that the body of a woman of fifty, blown up to monstrous dimensions by childbearing, then hardened, roughened by work till it was coarse in the grain like an over-ripe turnip, could be beautiful.

Children, from the first, were subjected to a severe hardening process, in some respects good--for example, they were not put in swaddling clothes.

This place was grimy and low, the girls were careless and hardened.

"That's a pretty girl," I remarked appreciatively. John's face hardened.

And if you ever put your foot over that threshold again’—here in an instant the smile hardened into a grin of rage, and he glared down at me with the face of a demon—‘I’ll throw you to the mastiff.’