Coldhearted; Also Thickened, Hardened Skin
This page is the CodyCross answer for the clue below from Greece, Group 679, Puzzle 1 (Maria Callas).
Question is: Coldhearted; Also Thickened, Hardened Skin
and the answer is: CALLOUS
Word Meaning:
CALLOUS — (figurative) Emotionally hardened; unfeeling and indifferent to the suffering/feelings of others.
Definitions from Wiktionary.