Synonyms for bad

adverse, appalling, atrocious, awful, crummy, deficient, deleterious, deplorable, detrimental, disadvantageous, disgraceful, dismal, dreadful, execrable, frightful, horrendous, inadequate, lamentable, lousy, miserable, negative, notorious, poor, poor-quality, regrettable, reprehensible, rotten, shoddy, substandard, terrible, unacceptable, unfavorable, unfortunate, unsatisfactory, wretched