Either from French indubitable or Latin indubitābilis.^[1] By surface analysis, in- +‎ dubitable.

• (UK) IPA^(key): /ɪnˈdjuːbɪtəbəl/
• (US) IPA^(key): /ɪnˈdubɪtəbəl/

• Audio (US):

  (file)

indubitable (comparative more indubitable, superlative most indubitable)

1. Clearly true; providing no possibility of doubt.

   The indubitable effect of the potion convinced many nonbelievers.

• undoubtable

indubitable (plural indubitables)

1. That which is indubitable.

   If we build logically upwards from a few indubitables, the whole system must remain correct.

Borrowed from Late Latin indūbitābilis.

• IPA^(key): /ɛ̃.dy.bi.tabl/

• Audio (France (Vosges)):

  (file)

indubitable (plural indubitables)

1. indubitable

   Synonym: incontestable

• indubitablement

• “indubitable”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012

From Latin indūbitābilis.

• IPA^(key): /indubiˈtable/ [ĩn̪.d̪u.β̞iˈt̪a.β̞le]
• Rhymes: -able
• Syllabification: in‧du‧bi‧ta‧ble

indubitable m or f (masculine and feminine plural indubitables)

1. indubitable

• “indubitable”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.8.1, Royal Spanish Academy [Spanish: Real Academia Española], 15 December 2025