麻木 (má mù): numb; insensitive; apathetic

He had walked in the snow for too long, and his toes had become numb from the cold, completely without feeling.

After the dentist gave him anesthesia, half of his face went numb, and he couldn't even smile.

He had sat in front of the computer for too long, and his legs had gone numb; he almost fell when he stood up.

Repeating the same work every day, he gradually felt numb and couldn't get interested in anything.

The war lasted for years, and people's hearts had become numb; they no longer shed tears over daily bad news.