Collocations for frustrating - adj.

be, prove
become, get
make sth
find sth
I found the delays intensely frustrating.

extremely, fairly, very, etc.
deeply (esp. BrE), incredibly, intensely, particularly, terribly
increasingly
a little, slightly, etc.
ultimately
It was an ultimately frustrating experience.

for
It was rather frustrating for all of us.

Frustrating is used with these nouns:
delay, wait