Lethargic describes a state of sluggishness or lack of energy. People who feel lethargic may find it difficult to concentrate, move, or engage in daily activities. This condition can be caused by various factors, including lack of sleep, poor nutrition, or underlying health issues. In some cases, lethargy can be a symptom of medical conditions such as depression, hypothyroidism, or anemia. It is important to identify the underlying cause to address the issue effectively. Lifestyle changes, such as regular exercise and a balanced diet, can help improve energy levels and reduce feelings of lethargy.