Neurasthenia (noun)

1. A nervous disorder characterized by fatigue, irritability, and various physical symptoms (such as headache, stomachache, neuralgia) that are not caused by any known organic pathology.
2. A condition of physical and mental exhaustion resulting from overwork or stress.

Origin:

From the greek νευρο- (neuro-) meaning "nervous" and ἀσθένεια (astheneia) meaning "weakness".

Examples:

1. The doctor diagnosed her with neurasthenia and recommended she take a break from her job.
2. The novel explores the theme of neurasthenia and how it affects the protagonist's ability to function in society.
3. His neurasthenia had been caused by the death of his father and the subsequent stress of caring for his family.
4. The neurasthenia of the individual, who had been working for over 60 hours a week, was so severe that he could barely stand.
5. The neurasthenia caused by constant stress at work had taken its toll on her health and well-being.