irrebuttable,a.|ɪrɪˈbʌtəb(ə)l| [ir-2.] That cannot be rebutted. a1834Coleridge Lit. Rem. (1838) III. 218 Compare this sixth section with the manful, senseful, irrebuttable fourth section.1892Daily News 23 Mar. 5/2 Perhaps..the presumption might be made absolute and irrebuttable.