Fatigue is a feeling of being extremely tired or exhausted.
You might feel fatigue after pulling an all-nighter studying for exams, or after running a marathon. It's that yucky sensation when your body and mind are like "Can I just take a nap now?" Fatigue can also be physical, like having sore muscles from working out too hard. But it can also be mental, feeling drained from dealing with stress or anxiety. Some people even experience fatigue after a major life change, like moving to a new country or starting a new job.
A weariness caused by exertion; exhaustion.
