From Longman Dictionary of Contemporary Englishvexatiousvex‧a‧tious /vekˈseɪʃəs/ adjective old-fashioned ANNOYmaking you feel annoyed or worried —vexatiously adverb
Examples from the Corpus
vexatious• No doubt it was very vexatious to Lanfranc, especially since he doubted whether their so-called saints deserved this title at all.From Longman Business Dictionaryvexatiousvex‧a‧tious /vekˈseɪʃəs/ adjectiveLAW vexatious legal actions are not serious or based on the truth, but are done only to annoy someoneWe may have found a way to get aroundvexatious shareholderlitigation. 