Someone once defined Frustration as the feeling you get when you are looking for your glasses without your glasses...
But i'll tell you what a better description would be...
Its the feeling you get when you go for a hair cut...and tell the barber to "just trim it" .........."zyaada chote mat karna bhai" and then you take off your specs, close your eyes and settle in for a relaxing haircut and head massage...AND THEN YOU OPEN YOUR EYES, PUT ON YOUR SPECS AND LOOK AT YOURSELF IN THE MIRROR...now...thats frustration..