† irreˈsponsal,a.Sc.Obs. [f. ir-2 + responsal a.] = irresponsible. 1637Rutherford Let. Lady Kenmure 7 Mar., Away, away with irresponsall Tutours, that would play me a slip. ― Let. Marg. FullertonLett. (1671) 308 They shall prove irresponsall debters: And therefore best here look ere we leap.