irrefutable

UK: /ˌɪrɪˈfjuːtəb^əl/, /ɪˈrɛfjʊtəb^əl/

US: /ɪˈrɛfjətəbəl, ˌɪrɪˈfjutəbəl/

US: (i ref′yə tə bəl, ir′i fyo̅o̅′tə bəl)

WordReference Random House Learner's Dictionary of American English © 2025

ir•ref•u•ta•ble /ɪˈrɛfyətəbəl, ˌɪrɪˈfyutəbəl/   adj. 

1. not refutable;
   that cannot be disproved or argued successfully against:
   an irrefutable argument.

WordReference Random House Unabridged Dictionary of American English © 2025

ir•ref•u•ta•ble  (i ref′yə tə bəl, ir′i fyo̅o̅′tə bəl), adj. 

1. that cannot be refuted or disproved:
   irrefutable logic.

• Late Latin irrefūtābilis. See ir-², refutable
• 1610–20

ir•ref′u•ta•bil′i•ty, ir•ref′u•ta•ble•ness, n. 
ir•ref′u•ta•bly, adv. 
Synonyms

indisputable, incontrovertible, undeniable.

Collins Concise English Dictionary © HarperCollins Publishers::

irrefutable / ɪˈrɛfjʊtəb^əl ˌɪrɪˈfjuːtəb^əl/ adjective

1. impossible to deny or disprove; incontrovertible

irˌrefutaˈbility, irˈrefutableness noun

irˈrefutably adverb