Possible Clues:

• Unfeeling
• Cruel
• Unemotional, and a hint to the hidden word in the answers to starred clues
• Unaffected by emotion
• �Lacking feeling hot� declared nervously
• Dicky and Lucia are so unsympathetic
• Merciless 'M*A*S*H' medic, with 19-Across?
• Unfriendly lord cheated outrageously
• Indifferent
• Unkind