overtaxing

arduous backbreaking burdensome cumbersome demanding difficult distressing excessive exhausting grueling harsh intolerable laborious oppressive painful rigorous severe strenuous taxing troublesome weighty

austere crushing embittering exacting exigent fatiguing formidable galling grave grinding hard headache heavy irksome merciless overpowering plodding ponderous pressing responsible serious tiresome tiring toilsome vexatious

calm easy effortless facile friendly gentle helpful mild nice simple trivial

light