beast·ly 
/ˈbi:stli/ adjective
beast·li·er; beast·li·est /ˈbi:stli/ adjective [also more beastly; most beastly] chiefly Brit : very unpleasant
▪ We've been having such beastly [=terrible] weather lately. ▪ What a beastly habit! ▪ beastly behavior
▪ We've been having such beastly [=terrible] weather lately. ▪ What a beastly habit! ▪ beastly behavior
— beast·li·ness noun [noncount]
