(of a kind) not suitable to be eaten

unpalatable

smelling or tasting mouldy

stuffy, aged

harmful

deadly, injurious

too ripe

decayed, decaying

having become decayed and smelling bad

rotten, stinking

having gone bad; very unpleasant, ill, bad etc

decayed, decaying

(of food) dry and unappetizing because not fresh; uninteresting because heard before; (of an athlete, musician etc) no longer able to perform well because of too much playing, training, practice etc

old, decayed

(of food) not good for one's health; harmful

unhealthful