having a rank, unpleasant, stale smell or taste, as through decomposition, esp. of fats or oils

rancid butter.

(of an odor or taste) rank, unpleasant, and stale

a rancid smell.

offensive or nasty; disagreeable.

adjective

perfumed , sweet

adjective

bad , carious , contaminated , curdled , decomposing , disagreeable , disgusting , evil-smelling , feculent , fetid , foul , frowzy , fusty , gamy , high , impure , loathsome , malodorous , moldy , musty , nasty , nidorous , noisome , noxious , off , offensive , olid , polluted , putrefactive , putrefied , putrescent , putrid , rank , reeky , repulsive , sharp , smelly , sour , soured , stale , stinking , strong , tainted , turned , unhealthy , whiffy , rotten , odorous , repugnant , spoiled , unpleasant