The Oxford Thesaurus An A-Z Dictionary of Synonyms - beastly adj.

1) uncivilized, uncultivated, uncivil, rude, crude, boorish, unrefined, coarse; cruel, inhuman, savage, barbaric, barbarous, bestial, brutal: Priscilla treats Cyril in a beastly way. 2) abominable, intolerable, offensive, unpleasant, awful, terrible, ghastly, horrid, disagreeable, horrible, hateful, execrable; foul, vile, nasty, rotten, dirty, filthy: If this beastly weather keeps up, the plane may be delayed.