functionless

From function +‎ -less.

functionless (not comparable)

lacking a function
- 2007 January 5, Ginia Bellafante, “With Ed, All’s Green on the Domestic Front”, in New York Times‎:
  “Living With Ed,” which makes its debut on HGTV on Sunday night, explores a marriage between two people with opposing domestic agendas and it is a delight, a “Green Acres” for an era in which we have come to expect Connecticut to feel like Cuba well past Columbus Day. The Begleys live in a modest two-bedroom home in Studio City, Calif., where Ms. Carson has a certain appreciation for fluff: big functionless pillows on her bed to supplement those used for sleeping.

English