rancid

Adjective
  1. (used of decomposing oils or fats) having a rank smell or taste usually due to a chemical change or decomposition (synset 301073991)
    "rancid butter"; "rancid bacon"
    similar to: stale - lacking freshness, palatability, or showing deterioration from age
  2. Smelling of fermentation or staleness (synset 301058621)
    similar to: ill-smelling, malodorous, malodourous, stinky, unpleasant-smelling - having an unpleasant smell
    same as: sour

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