Malaise (noun)

1. A general feeling of discomfort, illness, or unease whose exact cause is difficult to identify.
2. A vague feeling of physical discomfort or unease, often accompanied by a general sense of depression or unhappiness.

Origin:

From french malaise meaning "uneasiness or discomfort".

Examples:

1. The patient complained of a malaise that had been bothering him for weeks.
2. She was feeling a malaise that she couldn't quite explain.
3. The country was in a state of malaise, with high unemployment and a struggling economy.
4. The malaise was caused by a combination of stress and lack of sleep.
5. He was feeling a malaise and a general sense of unhappiness.