The term 'really, really bad' can be described using the crossword solutions of HORRIBLE (8 letters), AWFUL (5 letters), EVIL (4 letters), and ABYSMAL (7 letters). HORRIBLE is an extreme adjective used to describe something that is very unpleasant or offensive. AWFUL is a synonym for terrible, meaning extremely bad or unpleasant. EVIL is an adjective used to describe something that is morally wrong or bad. Lastly, ABYSMAL is an adjective used to describe something that is extremely bad or disappointing.