bad

very bad: awful, terrible, horrible, lousy informal, appalling, ghastly, atrocious, horrendous
 

bad, but not very bad: not very good, mediocre, second-rate, so-so, lacklustre
 

of bad quality: shoddy, inferior, poor quality, cheap, crummy informal
 

bad at doing something: be no good at something
 

very bad at doing something: hopeless, terrible, useless, lousy informal, incompetent
 

morally bad: evil, wicked, immoral, corrupt, sick, perverted, degenerate