English Reference
noun · verb

fatigue

n. · v.
US /fəˈtiɡ/ UK /fɐtˈiːɡ/ fa·tigue UK spelling fatiguing

  1. 01 B2 Upper Intermediate

    n.a feeling of being very tired, either in your body or your mind, after a lot of work or stress.

    n.extreme tiredness resulting from mental or physical exertion or illness. Uncountable in its general sense.

    Simple

    After working double shifts all week, she suffered from severe fatigue.

    In context

    The driver's fatigue was cited as a primary factor in the accident, as his reaction times were significantly impaired by lack of sleep.

    exhaustionwearinesslethargy
  2. 02 C1 Advanced Technical Science

    n.weakness in metal or other materials caused by repeated stress, which can lead to breaking.

    n.the weakening or failure of a material, such as metal, caused by repeated cycles of stress or strain.

    Simple

    The old bridge was closed because of metal fatigue in the main cables.

    In context

    Engineers conducted ultrasonic testing to detect signs of structural fatigue in the aircraft's fuselage before it was cleared for flight.

    weaknessbrittleness
  3. 03 C1 Advanced General-service

    n.strong clothes worn by soldiers when they are doing physical work rather than fighting.

    n.clothing worn by military personnel for manual labour or field duties, as opposed to dress uniforms. Usually plural.

    Simple

    The soldiers changed into their fatigues to help clear the mud after the flood.

    In context

    The recruits spent the afternoon in their olive-drab fatigues, performing the repetitive manual tasks required to maintain the base perimeter.

    uniformbattledress
  4. 04 B2 Upper Intermediate Formal

    v.to make someone feel very tired.

    v.to cause someone to become weary or exhausted through physical or mental effort.

    Simple

    The long climb up the mountain fatigued the hikers.

    In context

    The intense heat and humidity quickly fatigued the marathon runners, forcing many to drop out before the halfway mark.

  5. 05 C2 Proficiency Technical Cooking

    v.to make salad leaves soft by adding dressing or heat.

    v.to cause salad greens to wilt, typically by applying a hot dressing or through vigorous tossing.

    Simple

    The chef used a warm bacon dressing to fatigue the spinach leaves.

    In context

    To achieve the traditional texture of the dish, you must fatigue the greens just enough so they lose their crunch without becoming mushy.

They arrive describing fatigue, a shortened fuse, difficulty staying inside a thought long enough to finish it.

Aeon· 21 Aug 2026

This leads to shorter strides, slower walking, and faster fatigue.

ScienceDaily· 16 Aug 2026

Etymology 1

From French fatigue, from fatiguer, from Latin fatīgāre (“to weary, tire, vex, harass”).

Etymology 2

From French fatiguer, from Latin fatīgāre (“to weary, tire, vex, harass”).

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin Latin fatīgō
Level B2 · Upper Intermediate
Frequency Frequent
Updated