What does fatigued mean?
Fatigued describes the state of being worn out — physically, mentally, or both — typically as a result of sustained effort, long hours, illness, or stress. It sits above everyday 'tiredness' in intensity: a person who is fatigued has diminished energy and often reduced ability to concentrate, react, or perform. The word carries a somewhat formal or clinical tone, appearing frequently in medical notes, occupational-health discussions, and safety reporting about driver or worker fatigue, though it is perfectly natural in ordinary conversation when describing deep exhaustion. Common collocations include phrases like 'visibly fatigued' or 'fatigued from travel'. Its antonyms are states like refreshed, rested, or energized. As the past-participle-derived form of the verb 'to fatigue', it shares roots with 'indefatigable', a word for tireless persistence. Understanding 'fatigued' is useful precisely because it signals a degree of exhaustion that rest alone may not quickly resolve.
adjectiveExperiencing or affected by tiredness, especially physical or mental exhaustion resulting from prolonged exertion, effort, or stress. More pronounced than ordinary sleepiness and often accompanied by reduced capacity to perform.
- Physically or mentally exhausted as a result of exertion, effort, or stress (the dominant sense).
- Weakened or impaired by fatigue in a technical or medical context, such as materials science ('the metal was fatigued') or clinical descriptions of patients.
"After twelve hours on her feet in the emergency room, the nurse was utterly fatigued."
"The rescue team pressed on despite being visibly fatigued after the long ascent."
"Doctors noted that the patient appeared fatigued even after a full night's rest."
The word 'fatigue' comes straight from French, but it traces all the way back to a Latin word meaning to weary someone to the point of collapse — which is why 'fatigued' always sounds more serious than simply 'tired'.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of fatigued
Fatigued derives from 'fatigue', borrowed into English from French in the seventeenth century. The French word itself descends from Latin 'fatigare', meaning to weary or exhaust through labour. Related forms include 'fatigues' (military work clothing) and the adjective 'indefatigable', formed from Latin roots meaning untiring.
How fatigued is actually used
Slightly more formal or clinical than plain 'tired', 'fatigued' is common in medical writing, safety reports (e.g. 'driver fatigue'), and professional contexts where precision matters. It functions as an attributive adjective only rarely; it almost always appears predicatively ('she was fatigued') rather than before a noun.
Easily confused with fatigued
'Fatigued' means physically or mentally exhausted, while 'fatuous' means silly or pointless — the words merely resemble each other in spelling.