1. in a way that cannot be argued against or disputed; unquestionably
Usage: less common variant of ‘undoubtedly’ or ‘indisputably’

Examples

• She was undebatably the best player on the team.
• The evidence undebatably supports his theory.
• This is undebatably the most important decision we’ll make.
• He undebatably deserved the promotion.
• The results are undebatably impressive.