[{"Bold_text": "adjective", "List Items": ["requiring great exertion; laborious; difficult:an arduous undertaking.Synonyms: exhausting , burdensome , wearisome , onerous , toilsome , hard Antonyms: easy", "requiring or using much energy and vigor; strenuous:making an arduous effort.", "hard to climb; steep:an arduous path up the hill.", "hard to endure; full of hardships; severe:an arduous winter."]}]