Synonyms and related words :
aggravating, annoying, backbreaking, besetting, bothering, bothersome, burdensome, crushing, disturbing, exasperating, galling, grueling, harassing, heavy, hefty, importunate, importune, irking, irksome, irritating, mean, onerous, oppressive, painful, pesky, pestering, pestiferous, pestilent, pestilential, plaguesome, plaguey, plaguing, provoking, teasing, tiresome, tormenting, troublesome, troubling, troublous, trying, ugly, vexing, wearisome, wicked, worrisome, worrying