Unsleepy is a term that describes a feeling of being awake and alert, but what are its antonyms? The opposites of unawake, alert, and energetic are sluggish, drowsy, lethargic, inattentive, and lazy. When someone is sluggish, they find it difficult to function and tend to procrastinate. While being drowsy, an individual finds it difficult to stay alert and focused. Furthermore, lethargic means feeling overly tired and lacking enthusiasm. When they are inattentive, they are unobservant, unwatchful, and unbending their minds. Finally, lazy means lacking energy and enthusiasm, and enjoying leisure rather than work or other productive activities. Therefore, learning antonyms for unsleepy can help you express your feelings and emotions more effectively.