疲倦 is a compound word meaning 'tiredness' or 'weariness'—a physical or mental state of exhaustion. Both characters contribute to this meaning: 疲 (pí) means 'fatigue' or 'to tire', often implying bodily strain, while 倦 (juàn) conveys 'weariness', 'lassitude', or 'loss of enthusiasm', carrying a slightly more psychological or emotional nuance. Together, they reinforce each other, forming a common, neutral-term noun or adjective describing a deep, often prolonged sense of being drained.

This word appears frequently in everyday speech and writing to describe how someone feels after long work hours, illness, lack of sleep, or emotionally taxing situations. It’s more formal and literary than colloquial alternatives like 累 (lèi), and it often implies a heavier, more sustained fatigue—not just momentary tiredness. While it can modify nouns (e.g., 疲倦的眼神 'tired eyes'), it most commonly follows verbs like 感到, 显得, or 是 to describe a state.