demanding Synonyms

hard exacting taxing strict laborious difficult meticulous onerous strenuous arduous challenging tough rigorous burdensome stringent punitive punishing summoning superincumbent tall wearing rigid tight tiring toilful scrupulous stressful sharp punctilious seeking selective serious severe rough sisyphean soliciting squeamish steep requiring stern testing toilsome troublesome bratty nerve-wracking high-flying unpermissive pernickety picky back-breaking