Taxonomy of meanings for 不然:  

  • UNTRUE
    • NPabfactualuntruth
  • OR
    • VPadS1.postS2or, otherwise
  • DIFFERENT
    • VPibe different, behave differentlyLZ
    • VPpostadVdifferentlyLZ
  • IF
    • VPi(0)adS1.postS2or else, sinon; otherwise