undoubtedly
adv. sent.adv. used to say that something is definitely true and nobody can argue with it. You use it when you are completely sure about a fact or an opinion.
adv. without any doubt; certainly. Functions as a sentence-modifying disjunct to emphasize the speaker's certainty regarding the truth of a proposition.
She is undoubtedly the best player on the team.
The new policy is undoubtedly a step in the right direction for environmental protection.
While the initial investment is high, the long-term benefits of renewable energy are undoubtedly superior to those of fossil fuels.
From Middle English undoutedly, equivalent to undoubted + -ly.
Typically placed before the main verb, after the auxiliary verb, or at the beginning of a sentence for emphasis.
It is undoubtedly that he will win.He will undoubtedly win.Undoubtedly is an adverb and cannot be used as a predicate adjective following 'It is'; use 'undoubted' or 'beyond doubt' in that structure.