The best replacement for synergistic is additive.

The best alternatives to synergistic are rated as following:
★★★★★  additive
★★★★★  antagonistic
★★★  additive effect
★★★  synergic
★★★  additive effects
★★  synergetic
★★  symbiotic
★  permissive
  synergistic
  monergistic
  addictive

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