As an adjective undebatable
is not debatable; that cannot be debated.
As an adverb undebatably is
in a way that is not debatable; in an undebatable way.
undebatable
English
Adjective
(-)
Not debatable; that cannot be debated.
undebatably
English
Adverb
(
en adverb)
In a way that is not debatable; in an undebatable way.
Synonyms
* unarguably
* undisputably
Antonyms
* debatably