This is the 10178th most frequent Russian word.
бесспорно
Undoubtedly.
'Бесспорно' functions here as an adverbial modifier to indicate clear and evident admiration or recognition.
Его успехи в учебе бесспорно впечатляют.
His academic achievements undoubtedly impress.
'Бесспорно' is used to assert the undeniable quality of the statement that follows.
Тот факт, что он помог всем безвозмездно, бесспорно является признаком благородства.
The fact that he helped everyone selflessly undoubtedly is a mark of nobility.
'Бесспорно' is used as an introductory adverb to emphasize certainty or recognition of a statement.