At work we’ve talked about needing a word that means the opposite of synergy. So I did some searching and came up with a few options. :)
Technically, synergy doesn’t exclusively describe positive effects of working together, and can also be used to describe negative effects. But common use makes this unclear, so many have used “negative synergy” to be more specific.
Some say the opposite of synergism is antagonism, but the connotations of antagonism don’t work with situations where parties are trying to achieve mutually positive results.
I’ve seen dysynergy offered as an easily understood option. Personally, I think it sounds like a hack, and would rather find a more elegant solution.
Antergy is another logically constructed word that would fit the bill. I’ve read that it’s used as the opposite of synergy. It’s defined in “Coalition formation: a game-theoretic analysis” http://tinyurl.com/2jjg8a . However, the word could be reasonably understood to indicate a complete cancellation of the parts, which isn’t quite right. And in a different use, I’ve seen this in economic circles describing something which is more valuable as parts than as a whole, as when a conglomerate is purchased and split into several smaller companies which are then sold at great profit. Not exactly what we’re looking for.
This leaves dysergy. It’s almost as clear as dysynergy and is seems more elegant. It also is validated by being used exactly as desired in the field of mereology (the study of part/whole relations). http://tinyurl.com/2nsjmc
I vote for dysergy.