The phrase "looking alive" refers to a person appearing to be full of energy, enthusiasm, and vitality. The antonyms of this phrase include looking lifeless, dull, lethargic, and sluggish. When someone looks lifeless, they appear devoid of any energy or spirit. They may be disinterested or unresponsive to their surroundings. Similarly, someone who looks dull appears uninteresting, lacking any sparkle or shine. Lethargic refers to someone who moves slowly, sluggishly, and without energy or motivation. Therefore, to avoid looking lifeless, dull, or sluggish, it's important to maintain a healthy and active lifestyle, which includes regular exercise, healthy eating habits, and getting enough sleep.