'rancidification' may be an industry term for a chemical process, but that doesn't change the definition of 'rancid', which does in fact mean 'smells bad as in rotten'
Hence my entire paragraph discussing the concept of "subjective", and how some people have different opinions of "bad". I hate to be the bearer of bad news but: there exist 9 billion humans, and they have a wide range of opinions of what smells good and bad. Some of those opinions are in opposition to each other.
