Neurasthenia
/ˌnʊrəsˈθiːniə/
Definition 1 of 1
Pro Tip 1/3Medical Term
Neurasthenia is used in medical or psychological contexts to describe a specific condition. 
The patient was diagnosed with neurasthenia after reporting extreme fatigue.
Pro Tip 2/3Outdated Usage
Neurasthenia is sometimes considered outdated and less commonly used in modern medical practice. 
My grandmother mentioned she was treated for neurasthenia in her youth; these days it's called chronic fatigue.
Pro Tip 3/3Seriousness
Despite its historical context, 'neurasthenia' can convey a serious health issue, not just simple tiredness. 
After months of ignoring his symptoms, he finally sought help for his neurasthenia.