maddening
vexing
 SMART Vocabulary: related words and phrases 
 Annoying 
accursed
aggravating
annoying
annoyingly
ball-ache
exasperatingly
frustratingly
gadfly
galling
gallingly
irritatingly
limit
maddening
mither
naggingly
spiteful
stupid
trying
vexatious
vexatiously
infuriating | American Dictionary
infuriating
adjective
us/ɪnˈfjʊər·iˌeɪ·t̬ɪŋ/
causing anger and annoyance: 
It’s infuriating to be kept waiting this long!