not have the heart to do

not have the heart

To not have the emotional resolve (to do something); to be unable to do something, especially that which is or seems callous or unsympathetic. I didn't have the heart to tell her that I didn't love her anymore. How could you fire someone the day after their father died? I wouldn't have the heart.
See also: have, heart, not

not have the heart to do something

Fig. to be too compassionate to do something. I just don't have the heart to tell him the bad news.
See also: have, heart, not
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