GRUELLING Meaning of GRUELLING in English adj.Gruelling/grueling is used with these nouns: ↑ journey , ↑ process , ↑ race , ↑ schedule , ↑ test , ↑ tour , ↑ trek , ↑ work , ↑ workout Oxford Collocations English Dictionary. Оксфордский английский словарь словосочетаний . 2012