I1R1R1E1F4U1T1A1B3L1E1
16 points
IRREFUTABLE is validvalid
not refutable [adj] : IRREFUTABILITY [n], IRREFUTABLY [adv]
that cannot be refuted [adj IRREFUTABLY]
not refutable [adj] : IRREFUTABILITY [n], IRREFUTABLY [adv]
that cannot be refuted [adj IRREFUTABLY]