opposite of synergy

Synergy is what comes about when a whole is more than the sum of its parts. What word would you use for a whole that is less than the sum of its parts?

I want a word that doesn’t exclude the possibility that the whole is still good, overall — just less good than what one would expect. Thus, maybe not "disaccord." "Decadence" goes in the right direction (seen as a state of a society that results from a mixture of different social motivations), but I’m hoping for a word that isn’t specifically moral, but would apply to epistemic situations ("mixtures of justifications"), as well as, perhaps to aesthetic ones.