Respuesta :
Based on the non-underlined words in the sentence, the definition of the word callous could be - insensitive, uninterested, uncaring, harsh, cruel, etc.
I believe the answer is: Unsymphatetic
The word callous is commonly used to describe a person who tend to disregard other people's feeling or condition in their actions.
Callous people usually cannot get in touch with their emotion really well, which make them unsymphatetic to other people's struggle.