aggrieved
Meaning: distressed, wronged, injured
Usage: The foreman mercilessly overworked his aggrieved employees.
harrowing
Meaning: greatly distressing, vexing
Usage: The difficult hike through the storm was a harrowing experience.
trepidation
Meaning: fear, apprehension
Usage: Feeling great trepidation, Anya refused to jump into the pool because she thought she saw a shark in it.
anxiety
Meaning: intense uneasiness
Usage: Maya felt anxiety before presenting her project to the class.