[{"Bold_text": "adjective", "List Items": ["deviating from the usual or proper course in conduct or opinion; eccentric :erratic behavior.Synonyms: capricious , unstable , unpredictable Antonyms: stable , regular , consistent", "inconsistent, irregular, or unpredictable:Many factors affect purchasing power, such as inflation and erratic swings in the stock market.", "having no certain or definite course or pattern; wandering; not fixed:erratic winds.", "Geology.noting or pertaining to a boulder or the like carried by glacial ice and deposited some distance from its place of origin.", "(of a lichen) having no attachment to the surface on which it grows."]}, {"Bold_text": "noun", "List Items": ["an erratic or eccentric person.", "Geology.an erratic boulder or the like."]}]