extreme tiredness resulting from mental or physical exertion or illness, a reduction in the efficiency of a muscle or organ after prolonged activity

dead tired, run oneself ragged, hit the wall

combat fatigue, fatigue crack, muscle fatigue

Formal and Informal Expressions of fatigue

In different contexts, you can replace 'fatigue' with suitable alternatives. In a more formal setting, 'exhaustion, lassitude' is apt. In informal speech or writing, 'tiredness, weariness' is a commonplace synonym.

fatigue: Explore its Definition & Usage

fatigue Definition

1extreme tiredness resulting from mental or physical exertion or illness
2a reduction in the efficiency of a muscle or organ after prolonged activity

Using fatigue: Examples

Take a moment to familiarize yourself with how "fatigue" can be used in various situations through the following examples!

Example
The fatigue from the long hike was overwhelming.
Example
She was suffering from chronic fatigue syndrome.
Example
The metal fatigue caused the airplane to crash.
Example
The soldiers were suffering from battle fatigue.

fatigue Synonyms and Antonyms

Synonyms for fatigue

Antonyms for fatigue

Idioms Using fatigue

dead tired
completely exhausted
Example
After working a double shift, I was dead tired.
run oneself ragged
to work extremely hard and become very tired
Example
She had been running herself ragged trying to finish the project on time.
hit the wall
to suddenly become too tired to continue doing something
Example
After running for two hours, I hit the wall and had to stop.

Phrases with fatigue

combat fatigue
a psychological disorder caused by prolonged exposure to active warfare, also known as shell shock or post-traumatic stress disorder (PTSD)
Example
The soldiers were experiencing combat fatigue after months of fighting.
fatigue crack
a crack in a material caused by repeated stress or strain
Example
The metal fatigue caused a fatigue crack in the airplane's wing.
muscle fatigue
a reduction in the ability of a muscle to generate force due to prolonged activity
Example
The athlete experienced muscle fatigue during the marathon.

Origins of fatigue

from French 'fatigue', from Latin 'fatigare', meaning 'to tire'

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Summary: fatigue in Brief

The term 'fatigue' [fəˈtiːɡ] refers to extreme tiredness caused by physical or mental exertion or illness. It can also refer to a reduction in efficiency of a muscle or organ after prolonged activity, as in 'The metal fatigue caused the airplane to crash.' Phrases like 'combat fatigue' and idioms like 'run oneself ragged' denote exhaustion from specific contexts, while 'dead tired' and 'hit the wall' describe general states of extreme tiredness.