Same word as 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