adj.
VERBS
▪ be , prove
▪ become , get
▪ make sth
▪ find sth
▪
I found the delays intensely ~.
ADVERB
▪ extremely , fairly , very , etc.
▪ deeply ( esp. BrE ), incredibly , intensely , particularly , terribly
▪ increasingly
▪ a little , slightly , etc.
▪ ultimately
▪
It was an ultimately ~ experience.
PREPOSITION
▪ for
▪
It was rather ~ for all of us.
Frustrating is used with these nouns: ↑ delay , ↑ wait