Definition of "paintless"

paintless

adjective
not comparable
1. Without paint; unpainted, or whose paint has worn off.
  Quotations
  In 1919, demobilisation specials from Purfleet, Essex, to the North, usually made up of nondescript, almost paintless or grey stock which had seen long wartime service, chalked with slogans, were worked through by way of Bromley and the North London line […] .
  1950 April, R. A. H. Weight, “They Passed by My Window”, in Railway Magazine, pages 258-259
  Residences of a development named Hilltop Place mimic wooden farmhouses with barns attached, painted gray to look paintless but remain tidy.
  2000, Donald Hall, Here at Eagle Pond