The best replacement for spontaneous is non spontaneous.

The best alternatives to spontaneous are rated as following:
★★★★★  non spontaneous
★★★★  induced mutations
★★★★  impulsive
★★★  romantic
★★  stimulated emission
★★  deliberate
★★  induced mutation
★★  planned
★  planner
★  nonspontaneous
★  induced abortion
  natural processes result in an increase in entropy
  missed abortion
  instantaneous
  induced
  biogenesis

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