LATIN DICTIONARYLexicon Latīnum
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“undoubtedly” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

undoubtedly
haud dubie: certe. [Vid: CERTAINLY.]
As an answer, certe: sane or vero (often with the verb used in the question): sane quidem. Sometimes recte: optime (of courteous assent). Do you grant us this? dasne hoc nobis? Undoubtedly I do, do sane (Pract., Intr. ii. 148, 149).

Quick answer

What is the Latin word for undoubtedly?
The usual Latin words for “undoubtedly” are certus, sānus, vērō; also rēctus, bonus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.