A teenager not calling their parents and staying out all night is an example of to anguish.
Being very worried about something is an example of anguish.
Having terrible back pain is an example of anguish.
Origin of anguish
- Middle English angwisshe from Old French anguisse from Latin angustiae distress from angustus narrow angh- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition