disruptive

adj

1. Causing disruption or unrest.

   “Children who exhibit disruptive behaviour may be expelled from school.”

2. Causing major change, as in a market.

   “disruptive technologies”

   “Each time a disruptive technology emerged, between one-half and two-thirds of the established manufacturers failed to introduce models employing the new architecture—in stark contrast to their timely launches of critical sustaining technologies.”

   “[…] companies tend to lose their leadership positions to companies that enter the market with a disruptive technology or market change.”