Synonyms for Inedible:

adj.

all (adjective)
uneatable.
unpalatable (adjective)
uneatable, spoiled, unsavory, tasteless, sour, rancid, nauseating, tainted, bitter, turned, sickening, poisonous, contaminated, unappetizing, not fit to eat, indigestible, yukky, unpleasant-tasting, bad, rotten, disagreeable.
unsavory (adjective)
unpalatable.

n.

stale, unpalatable, bland, nasty, insipid. inedible (noun)
poisonous, uneatable.
unpalatable (noun)
yukky, rotten, turned, rancid, bitter, sickening, not fit for human consumption, unwholesome, harmful, sour, tasteless, indigestible, contaminated, unappetizing, tainted, unsavory, spoiled, not fit to eat, bad, nauseating, unpleasant-tasting, offensive, foul-tasting, disagreeable.

Other synonyms:

unappetizing, stale, rancid, unsavory, bland, insipid, tainted, spoiled. tasteless, nasty, sour. bad. inedible
indigestible.
unhealthful
unwholesome.
Other relevant words:
sickening, sour, offensive, insipid, turned, contaminated, bad, bland, bitter, disagreeable, nauseating, spoiled, unappetizing, yukky, unpalatable, tasteless, indigestible, rancid, rotten, nasty, not fit to eat, tainted, unsavory.