The word "unsleepingly" means without sleep or staying awake for a long time. Synonyms for unsleepingly include incessantly, relentlessly, tirelessly, unceasingly, and all-night. These words refer to a person's ability to stay awake for an extended period without taking a break or going to sleep. Other synonyms for unsleepingly may include wakefully, vigilantly, watchfully, persistently, and steadfastly. Each of these words has a slightly different connotation and usage in various contexts. Whether you are talking about studying for exams, working overnight shifts, or simply staying up to watch a movie, the synonyms for unsleepingly can help you express your thoughts more precisely.