aggravating (adj.)

• annoying
• bothersome
• contentious
• disturbing
• exasperating
• galling
• importunate
• irksome
• irritating
• pesky
• pestering
• pestiferous
• pestilent
• pestilential
• plaguey
• provocative
• provoking
• teasing
• tiresome
• troublesome
• troubling
• vexatious
• vexing
• wearisome
• worrisome
• worrying