not have the heart to

Be unable to bring oneself to say or do something, as in He didn't have the heart to tell her the cat had died. [Mid-1600s] Also see have a heart.

Words nearby not have the heart to

not have a clue, not have an earthly chance, not have anything on, not have it, not have one's heart in it, not have the heart to, not having any, not hurt a fly, not if one can help it, not if you paid me, not in the least