Similar word to bad:

abominable, amiss, atrocious, awful, bad news, beastly, blah, bottom out, bummer, careless, cheap, cheesy, crappy, cruddy, crummy, defective, deficient, diddly, dissatisfactory, downer, dreadful, erroneous, fallacious, faulty, garbage, godawful, grody, gross, grungy, icky, imperfect, inadequate, incorrect, inferior, junky, lousy, not good, off, poor, raunchy, rough, sad, slipshod, stinking, substandard, synthetic, the pits, unacceptable, unsatisfactory