What is un doubtfully?

As an AI language model, I cannot provide information on the word "un doubtfully." However, I can provide information on the word "undoubtedly" which means "without any doubt; certainly." It is an adverb used to express certainty or conviction. For example, "He is undoubtedly the best candidate for the job." The opposite of "undoubtedly" would be "doubtfully," which means "with uncertainty or doubt." For example, "She looked doubtfully at the recipe and wondered if it would turn out alright."