The antonyms for the phrase "looked alive" can range from dull, lifeless, and lethargic to tired, weak, and sickly. When someone doesn't look alive, they often have a pale complexion, sunken eyes, and lack of energy. They may have a strained expression, indicating pain or discomfort. Alternatively, a person who looks alive could appear radiant, energetic, and full of vitality. Antonyms for being "alive" may also include being unwell, deceased, or lifeless. These antonyms all highlight the importance of maintaining a healthy and active lifestyle to look and feel alive.