pesky (adj.)

• aggravating
• annoying
• awful
• bothersome
• damned
• disturbing
• dreadful
• exasperating
• galling
• importunate
• irksome
• irritating
• mean
• monstrous
• pestering
• pestiferous
• pestilent
• pestilential
• plaguey
• provoking
• teasing
• tiresome
• troublesome
• troubling
• troublous
• ugly
• vexatious
• vexing
• wearisome
• wicked
• worrisome
• worrying