Définitions
1.AdjectivePertaining to, or having the form, nature, or habits of, a beast.
2.AdjectiveSimilar to the nature of a beast; contrary to the nature and dignity of human beings."beastly culture"
3.AdjectiveAbominable; very unpleasant; hideous."beastly weather; Stop being so beastly to her!"
4.AdjectiveOf computer hardware or motor vehicles etc.: ostentatiously powerful.
5.AdverbLike a beast; brutishly.
6.AdverbVery much; terribly.