Synonyms for Exasperating (same or very similar meaning)
WordNet sense 1 (extremely annoying or displeasing):
infuriating, maddening, vexingWordNet sense 2 (causing displeasure or lacking pleasing qualities):
displeasingWordNet sense 3 (making worse):
aggravating, exacerbatingWordNet sense 4 (increasing in strength or intensity):
intensifyingFrom the ODE community, based on WordNetadd/edit