Webster's English Dictionary

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irrefutable

ir.re.fut.able \.ir-i-'fyu:t-*-b*l, (')ir-'(r)ef-y*t-\ \-ble-\ aj [LL 
   irrefutabilis, fr. L in- + refutare to refute] : impossible to refute : 
   INCONTROVERTIBLE  - ir.re.fut.ably av