Which word fits better: Frustration or Irritation
Both are unpleasant feelings. Frustration is experienced as a result of something that you want to happen but it just doesn’t. Irritation is experienced as a result of something that you don’t want to happen but it just keeps happening.
Example for frustration: You want to work with a machine and you find it extremely complicated. You try different ways but you can’t get the hang of it. After trying a couple of times, a sense of frustration overcomes you (Here you want being able to work with the machine happens but it doesn’t).
Example for irritation: You are used to taking a nap after lunch. Everyday as soon as your head hits the pillow, the builders working in the construction site next to your house start working and make a lot of noise. Here the construction site is a source of irritation. (You don’t want to hear the noise but you have to hear it everyday because it keeps happening).