adj. 25B6; adjective
rotten meat : DECAYING, rotting, bad, off, decomposing, putrid, putrescent, perished, mouldy, mouldering, mildewy, rancid, festering, fetid; addled; maggoty, wormy, flyblown.
rotten teeth : DECAYING, decayed, carious, black; disintegrating, crumbling.
he's rotten to the core : CORRUPT, unprincipled, dishonest, dishonourable, unscrupulous, untrustworthy, immoral; villainous, bad, wicked, evil, iniquitous, venal; informal crooked, warped; Brit. informal bent.
(informal) a rotten thing to do : NASTY, unkind, unpleasant, obnoxious, vile, contemptible, despicable, shabby; spiteful, mean, malicious, hateful, hurtful; unfair, uncharitable, uncalled for; informal dirty, low-down; Brit. informal out of order.
(informal) he was a rotten singer : BAD, poor, dreadful, awful, terrible, frightful, atrocious, hopeless, inadequate, inferior, substandard; informal crummy, pathetic, useless, lousy, appalling, abysmal, dire; Brit. informal duff, rubbish, a load of pants.
(informal) I feel rotten about it : GUILTY, conscience-stricken, remorseful, ashamed, shamefaced, chastened, contrite, sorry, regretful, repentant, penitent.
(informal) I felt rotten with that cold. : See ill adjective sense 1.
fresh, honourable, kind, good, well.