overengineer

over- +‎ engineer

overengineer (third-person singular simple present overengineers, present participle overengineering, simple past and past participle overengineered)

1. To make something more complicated than necessary; often implies that the complexity was added intentionally.
   • 2007 January 31, Martin Fackler, “Hobbled by Disappointing Sales and a Loss at the Game Unit, Sony's Profit Drops 5%”, in New York Times‎:

     While PlayStation 3 surpasses both Wii and Xbox 360 in performance and graphics, the critics say it suffers from the same problem as many other Sony products: it is overengineered, scaring away average shoppers.

• overdesign