Well, at the moment I just feel a little frustrated, but for no particular reason. As it were, I have a passive form of frustration, and not an active one. There is no genetive of cause to my frustration, though I suppose there could be a direct object... at the moment it would stand as a reflexive, but were some other to cross my path, I suppose it could become a simple accusative.
Eh, that's the grammar of frustration, I suppose.
(Nb. this 'genetive of cause'... if those of you versed in English grammar go 'what the heck is he talking about?' it's not an English form, but the Greek genetive of means. I am generally tending to have Greek grammatical constructions through-running my mind, hence my overly active use of participles in sentences, a thing more like to Greek than English.)