Rancid (adjective)

Having a strong, unpleasant smell or taste usually caused by being old and stale.

Origin:

Early 18th century: from latin rancidus "rancid", from ranciare "grow rank", from rancor "rankness".

Examples:

1. The butter had gone rancid and had to be thrown away.
2. The milk was rancid and had to be poured down the drain.
3. The nuts had a rancid smell and were not fit to eat.
4. The cheese was rancid and had to be discarded.
5. The oil was rancid and had to be replaced.