"Deep frustration" refers to a strong feeling of disappointment, annoyance, or anger that comes from a situation or problem that is very difficult to solve or overcome. Full definition
Do you see some signs of deep frustration, anger or rebellion towards friends, family or previous lovers if he / she has some? (trusteddatingsiteadvisory.com)
There's a reason that people all over the world use the program, and that parents are able to go from deep frustration to lasting positive changes in their families. (empoweringparents.com)
I experienced deep frustration at not being able to deal with this on my own, but I hid it behind a smile when I was with people outside of my immediate family. (mindbodygreen.com)