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

Synonyms:

fetid, saturnine, rotten, malodorous, moldy, disagreeable, mephitic, glum, off, pungent, noisome, sour, false, foul, gamy, frowzy, dark, spoiled, tainted, noxious, bad, musty, sullen, fresh, stale, off-key, disgusting, nasty, putrid, stinking, unhealthy, smells, rank, strong, sharp, reeky, glowering, high, smelly, offensive, dour, morose, fragrant, polluted, moody, fusty, impure, turned

Usage examples:

• Rancid animal fat on the other hand, smells " off." - "How and When to Be Your Own Doctor", Dr. Isabelle A. Moser with Steve Solomon.
• Do we commend an Eskimo for preferring the flavor of rancid fish oil to the delicate bouquet of the finest French wine? - "Primitive Love and Love-Stories", Henry Theophilus Finck.
• This is perhaps the most convenient form in which to buy them, but unfortunately, they are too frequently old and rancid. - "The Pecan and its Culture", H. Harold Hume.