irrefutable + -ly
irrefutably (comparative more irrefutably, superlative most irrefutably)
- In an irrefutable manner; beyond the possibility of refutation.
- “irrefutably” in Noah Webster, An American Dictionary of the English Language, volume I (A–I), 1st edition, New York, N.Y.: Published by S. Converse; printed by Hezekiah Howe, New Haven, 1828, OCLC 999480247.
- irrefutably in The Century Dictionary, The Century Co., New York, 1911