unˈtrilled,ppl.a. (un-1 8.) 1866Jrnl.Amer. Oriental Soc. VIII. 342 The production of this untrilled r may be carried as far back in the mouth as we choose.1869Ellis E.E. Pron. ii. 603/1 The peculiar English untrilled r.1874Sweet in Trans.Philol.Soc. 471 Untrilled consonants.