Unarguably is an adverb that means something is definitely true or cannot be disputed. Synonyms for unarguably include undoubtedly, indisputably, unquestionably, certainly, surely, and unequivocally. All of these words express the idea that something is impossible to deny, without any doubt or uncertainty. They are often used to emphasize the strength of a statement or argument, and to make it clear that there is no room for disagreement or debate. When something is unarguable, it is a fact that cannot be challenged or disputed by anyone, and the use of synonyms for unarguably can help to emphasize this certainty.