insensibile Englisch:

Bad enough that other people were being so callous, but this was his own mother.

a callous killer/attitude/act

callous murder

His callous disregard of her feelings' upset her

His callous comments about the murder made me shiver.

It might sound callous, but I don't care if he's homeless. He's not living with me!

... revulsion at such a callous attack.”

The famous actress is callous to her mother who has a financial problems