a feeling of deep dread, anxiety, apprehension, or insecurity, especially one that is general and unfocused and related to the state of the world or the human condition;
e.g. Lately, she has been filled with angst as she contemplates her existence.
(noun)
a persistent feeling of being nervous or worried, especially about trivial or ordinary matters;
e.g. He has been experiencing adolescent angst about his appearance.