1Chronic fatigue syndrome is a condition characterized by persistent and profound exhaustion that is not alleviated by rest.
2Was the pilot's error due to fatigue after flying for several hours without a break?
3The fatigue of the metal beam was evident in its weakened structure after years of exposure to extreme temperatures.
4Try to avoid driver fatigue by taking regular breaks during long road trips.
5Researchers are studying the effects of fatigue on the human immune system and its potential links to various diseases.