The term "sunken-eyed" generally refers to someone with deeply recessed eyes, usually due to exhaustion or malnutrition. Some antonyms for this expression that portray alertness, energy, and vitality could include radiant, gleaming, sparkling, bright-eyed, bushy-tailed, and wide-awake. Other antonyms for sunken-eyed depending on the context can be words such as alert, focused, fresh, healthy, and rejuvenated. Using these antonyms in place of "sunken-eyed" paints a more positive picture and helps to convey a sense of well-being, alertness, and active engagement, as opposed to a sense of fatigue or sadness.