[{"Bold_text": "noun", "List Items": ["something that a person cannot conquer, achieve, etc.:The performance test proved to be my nemesis.Synonyms: Waterloo", "an opponent or rival whom a person cannot best or overcome.", "(initial capital letter)Classical Mythology.the goddess of divine retribution.", "an agent or act of retribution or punishment.Synonyms: Waterloo , ruin , undoing , downfall"]}]