unˈmetalled,ppl.a. (un-1 8.) 1843in T. J. Dyke Addr. Public Medicine (1885) 2 The unmetalled and unchannelled highways and streets.1862Patterson Ess.Hist. & Art 211 The continuation of this road..is unmetalled.1897Trans.Roy.Hist.Soc. XI. 72 The balks..seem to be..unmetalled roadways.