Rancid means sour, rotten, and nasty and refers most specifically to the sharp bad smell of decomposing oils or fats. "Rancid" is a great name for a post-punk band, but a lousy way to describe the sauce on your eggs Benedict.

If you've never had the pleasure of smelling something rancid, life has quite a wallop in store for you. As meat, fat, or oil decomposes the chemical change creates a sharp wretched stink that will cause you to recoil. It's just foul. The powerful horrendous fragrance of rancid butter, therefore, makes the word wonderfully potent to describe all sorts of things — from a corrupt dictatorship to a party that's gone on a few hours too long.

Definitions of rancid
  1. adjective
    (used of decomposing oils or fats) having a rank smell or taste usually due to a chemical change or decomposition
    rancid butter”
    rancid bacon”
    lacking freshness, palatability, or showing deterioration from age
  2. adjective
    smelling of fermentation or staleness
    synonyms: sour
    ill-smelling, malodorous, malodourous, stinky, unpleasant-smelling
    having an unpleasant smell
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