of poor quality or a low standard
a bad diet
bad eyesight
not such as to be hoped for or desired; unpleasant or unwelcome
bad news
it was the worst day of his life
bad luck
(of food) decayed; putrid
everything in the fridge went bad
regretful, guilty, or ashamed about something
she feels bad about ending their engagement
I feel bad that our business is benefiting from something so horrible
good; excellent
they want the baddest, best-looking Corvette there is
badly
he beat her up real bad