adj.無原因的;無緣無故的
He became more irritable than ever, and it was Princess Marya who as a rule bore the brunt of his outbursts of causeless fury. 他已經(jīng)變得比從前更易于激動(dòng),多半在公爵小姐瑪麗亞身上發(fā)泄他那無緣無故的怒火。