How is "fatigue" best described?

Fatigue is best described as extreme tiredness or exhaustion, reflecting a state where an individual experiences a significant decrease in physical or mental energy. This condition often goes beyond mere feelings of tiredness, encompassing a sense of weariness that affects daily activities and overall functioning. Individuals experiencing fatigue may find it challenging to engage in normal tasks, and it can be a result of various factors, including physical exertion, emotional stress, or underlying medical conditions.

In contrast, light tiredness suggests a mild form of fatigue that typically resolves with rest, failing to capture the intensity of extreme fatigue. Increased energy levels and short bursts of activity indicate the opposite of fatigue, as they imply vitality and the ability to perform tasks efficiently. Therefore, the most accurate characterization of fatigue is its association with profound weariness or exhaustion.