她对穷人困境的漠不关心令人心寒。

Her ___callousness towards the poor's struggles was chilling.

他对病人痛苦的漠不关心让所有人都感到震惊。

His ___callousness toward the patients' suffering shocked everyone.

他对别人苦难的无动于衷令人震惊。

His ___callousness towards others' suffering was shocking.