The best replacement for complexity is simplicity.

The best alternatives to complexity are rated as following:
★★★★★  simplicity
★★★★  difficulty
★★  optic
★★  strictly business
★★  depth
★★  impact
★★  faze
★★  chaos
★  lmq
★  exertus
★  environmental change
★  dynamic complexity
★  reductionism
  nip
  3d
  runtime complexity
  complication
  space complexity
  detail
  team 3d
  envyus
  innovation
  time complexity
  scale by scale simplicity
  high complexity

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Speaking about complexity, one probably shouldn't forget about complexity.

Other search terms related to complexity and their ratings are:
★★★★★ complexity
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Google Trends

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complexity
simplicity
difficulty