endurcir betyder på engelska

harden [hardened, hardening, hardens]▼◼◼◼(make hard(er))
verb
[UK: ˈhɑːd.n̩] [US: ˈhɑːr.dn̩]Her heart has been hardening all throughout her string of bad hookups. = Son cœur s'est endurci au fil de sa série de coups pourris.

stiffen [stiffened, stiffening, stiffens]▼◼◻◻(to make stiff)
verb
[UK: ˈstɪf.n̩] [US: ˈstɪf.n̩]

inure [inured, inuring, inures]▼◼◻◻(to cause to become accustomed to something unpleasant by prolonged exposure)
verb
[UK: ɪ.ˈnjʊə(r)] [US: ˌɪ.ˈnjʊr]

stiffen [stiffened, stiffening, stiffens]▼(to become stiff)
verb
[UK: ˈstɪf.n̩] [US: ˈstɪf.n̩]