I had the most irrefragable evidence of the absolute truth and soundness of the principle upon which my invention was based.
-- Sir Henry Bessemer, Autobiography
On June 4, the Citizen featured an interview with the Joneses' lawyer, R. S. Newcombe, who insisted that at the pending manslaughter trial he would bring "positive, absolute, irrefragable proof from . . . the most eminent scientists in the world" to show that both the Bates and Hunt operations were necessary and that no surgeon could have saved their lives.
-- Regina Morantz-Sanchez, Conduct Unbecoming a Woman
Irrefragable derives from Late Latin irrefragabilis, from Latin in-, "not" + refragari, "to oppose."