hardened
adjective uk/ˈhɑː.dənd/ us/ˈhɑːr.dənd/
[ before noun ]久经锻炼的
used to describe someone who has had a lot of bad experiences and as a result no longer gets upset or shocked
hardened detectives/reporters 老练的侦探／记者
[ before noun ]（丑恶的生活方式）无法改变的；不再惭愧的
no longer likely to change a bad way of life or feel sorry about it
a hardened criminal 惯犯
be/become hardened to something 变得对…不在乎
to develop a way of dealing with a sad situation so that it no longer upsets you
You see all sorts of terrible things when you're a nurse so you become hardened to it. 当护士时见过各种可怕的事，于是你就对这些习以为常了。
After so many scandals, the public has become hardened to this sort of misbehaviour.
Even teh village's children have become hardened to the violence of the war.
She was as hardened to the suffering of others as she was to her own.
I couldn't ever be a veterinarian - I'd never be able to become hardened to seeing animals in pain.