irretraceable,a.|ɪrɪˈtreɪsəb(ə)l| [ir-2.] That cannot be retraced. 1847in Craig.a1859De Quincey Posth.Wks. (1891) I. 23 An error..travels off into..spaces incalculable and irretraceable.1876Holland Sev. Oaks xii. 168 He had taken a step upward and forward, a step irretraceable.