Rancid

a.

1.

Having a rank smell or taste, from chemical change or decomposition; musty; as, rancid oil or butter.

Adj.	1.	rancid - used of decomposing oils or fats; "rancid butter"; "rancid bacon"
	2.	rancid - smelling of fermentation or staleness Synonyms: sour

awful, bad, bad-smelling, barfy, blown, brackish, cloying, corrupt, decayed, disagreeable, fecal, fetid, foul, frowsty, frowy, frowzy, fulsome, funky, fusty, gamy, graveolent, high, icky, ill-smelling, loathsome, maggoty, malodorous, mawkish, mephitic, miasmal, miasmic, mildewed, mildewy, moldy, nasty, nauseant, nauseating, nauseous, nidorous, noisome, noxious, odious, odorous, off, offensive, olid, overripe, poisonous, reasty, reasy, rebarbative, reechy, reeking, reeky, repulsive, ripe, sickening, smellful, smelling, smelly, soured, spoilt, stale, stenchy, stinking, strong, stuffy, sulfurous, turned, vile, vomity, weevily, yucky