opposite of synergy

uncooperative resonates with an early definition of emergence:

The philosopher G. H. Lewes coined the term "emergent", writing in 1875:

Every resultant is either a sum or a difference of the co-operant forces; their sum, when their directions are the same – their difference, when their directions are contrary. Further, every resultant is clearly traceable in its components, because these are homogeneous and commensurable. It is otherwise with emergents, when, instead of adding measurable motion to measurable motion, or things of one kind to other individuals of their kind, there is a co-operation of things of unlike kinds. The emergent is unlike its components insofar as these are incommensurable, and it cannot be reduced to their sum or their difference. wikipedia

Alternatively, reduced might work (e.g. a synergistic vs a reduced system), alluding to the chemical notion of reduction, as in redox: reduction-oxidation