fedupness
'Fedupness' is what mothers get filled up with when they constantly have to tell a child off for being disobedient. The child, however, of course thinks it's totally unfair for the mother to be like that.
"Mum's full of fedupness again. Had a real go at me last night for no reason at all."
fedup
This is an irish word that can be taken to mean absolutelly tired waiting on something or loosing interest in something or sick + bored doing something (had enough of soemthing).
I am fedup waiting on this bartender to serve us the pints !
fedupism
The general feeling of being fed-up
The feeling of fedupism as been rising all over the country, because Boris is being a c**t.