[{"Bold_text": "adjective", "List Items": ["made hard; hardened.Synonyms: hard Antonyms: soft", "insensitive ; indifferent ;unsympathetic:They have a callous attitude toward the sufferings of others.Synonyms: obtuse , insensible Antonyms: sensitive", "having a callus; indurated, as parts of the skin exposed to friction."]}, {"Bold_text": "verb (used with or without object)", "List Items": ["to make or become hard or callous."]}]