demanding

acquisitive ambitious assertive burdensome captious challenge challenges critical difficult difficult effortful exact exigent fastidious grueling hard hard-to-please harder hypercritical impatient insatiable intensive jealous more critical more difficult more difficult more intensive more pressing more stringent more urgent most pressing most urgent no-nonsense onerous oppressive overcritical pressing requesting requiring rugged severe strenuous stringent tall taller tallest taxing tiresome tiring toilsome tough tougher toughest troublesome trying tyrannical unforbearing unforgiving ungrateful urgent weighty