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rotten 
1 bad, corroded, corrupt, crumbling, decayed, decaying, decomposed, decomposing, disintegrating, festering, fetid, foul, mouldering, mouldy, perished, putrescent, putrid, rank, sour, stinking, tainted, unsound 
2 bent  (slang) corrupt, crooked  (informal) deceitful, degenerate, dishonest, dishonourable, disloyal, faithless, immoral, mercenary, perfidious, sink, treacherous, untrustworthy, venal, vicious 
3  (informal) base, contemptible, despicable, dirty, disagreeable, filthy, mean, nasty, scurrilous, shitty  (taboo slang) unpleasant, vile, wicked 
4  (informal) bad, deplorable, disappointing, regrettable, unfortunate, unlucky 
5  (informal) chickenshit  (U.S. slang) crummy  (slang) duff  (Brit. informal) ill-considered, ill-thought-out, inadequate, inferior, lousy  (slang) low-grade, of a sort  or  of sorts, poor, poxy  (slang) punk, ropey  or  ropy  (Brit. informal) sorry, substandard, unacceptable, unsatisfactory 
6  (informal) bad, below par, ill, off colour, poorly  (informal) ropey  or  ropy  (Brit. informal) rough  (informal) sick, under the weather  (informal) unwell 
 
Antonyms  
 
1 fresh, good, pure, sweet, wholesome 
2 decent, honest, honourable, moral, scrupulous, trustworthy