Disquietude (noun)

A state of unease or agitation; restlessness, worry, or anxiety.

Origin:

Derived from the latin word 'dis' meaning 'not' and 'quietus' meaning 'rest or peace'. the term has been used in english since the 16th century to describe a state of unrest or unease.

Examples:

1. His disquietude was evident in the way he constantly fidgeted.
2. Her disquietude about the future of her job caused her to lose sleep.
3. The disquietude of the stock market led many investors to sell their stocks.
4. The disquietude in the room was palpable as the judge read out the verdict.
5. His disquietude about his performance on the exam was unwarranted as he did very well.