callous
From LSJ
adj.
P. and V. σχέτλιος, ἀγνώμων, V. δυσάλγητος.
Pitiless: V. νηλής.
Blunted in feeling: P. and V. ἀμβλύς, ἀνάλγητος.
Make callous, v.: P. and V. ἀμβλύνειν, ἀπαμβλύνειν, V. καταμβλύνειν.
Grow callous about private misfortunes: P. ἀπαλγεῖν τὰ ἴδια (Thuc. 2, 61).