harden in Russian
harden in Russian
затверде́ть
(intransitive) To become hard.
тверде́ть
(intransitive) To become hard.
ожесточить
(ambitransitive) To become or make (a person or thing) resistant or less sensitive.
ожесточиться
(ambitransitive) To become or make (a person or thing) resistant or less sensitive.