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harden

harden /ˈhɑɚdn̩/ verb
hardens; hardened; hardening
harden
/ˈhɑɚdn̩/
verb
hardens; hardened; hardening
Britannica Dictionary definition of HARDEN
: to become hard or firm or to make (something) hard or firm
[no object]
[+ object]
: to become more definite and strongly felt or to make (something) more definite and strongly felt
[no object]
[+ object]
[+ object] : to make (someone) hard : to make (someone) less emotional and less likely to feel sorry for other people
[no object] : to begin to be or seem harsh, angry, serious, etc.

harden your heart

◊ If you harden your heart or if something hardens your heart, you stop having kind or friendly feelings for someone.

— hardener

/ˈhɑɚdnɚ/ noun, plural hardeners [count]

— hardening

noun [noncount]