BEASTLY Meaning of BEASTLY in English adj. & adv.adj. (beastlier, beastliest) 1 colloq. objectionable, unpleasant. 2 like a beast; brutal. adv. colloq. very, extremely. beastliness n. Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012