undoubtedly
Word family (noun) doubt doubter (adjective) doubtful doubtless indubitable undoubted (verb) doubt (adverb) doubtfully indubitably undoubtedly
From Longman Dictionary of Contemporary Englishundoubtedlyun‧doubt‧ed‧ly /ʌnˈdaʊtɪdli/ ●●○ adverb used for saying that something is definitely true That is undoubtedly true.[sentence adverb] Undoubtedly, public interest in folk music has declined.