Definition: (adjective) Causing irritation or annoyance.
Synonyms: annoying, bothersome, galling, irritating, nettlesome, pesky, pestering, plaguey, teasing, pestiferous.
Usage: Our new acquaintance had become involved in a vexatious difficulty with his pipe which had suddenly betrayed his trust and disappointed his anticipation of self-indulgence.
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Source: The Free Dictionary