[{"Bold_text": "adjective", "List Items": ["characterized by vigorous exertion, as action, efforts, life, etc.:a strenuous afternoon of hunting.", "demanding or requiring vigorous exertion; laborious:To think deeply is a strenuous task.Antonyms: easy", "vigorous, energetic, or zealously active:a strenuous person; a strenuous intellect.Synonyms: forceful"]}]