not called in question; accepted as beyond doubt; undisputed.

1425–75; late Middle English; see un-1, doubt, -ed2

undoubtedly, adverb
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undoubted (ʌnˈdaʊtɪd)
beyond doubt; certain or indisputable

undoubtedly (ʌnˈdaʊtɪdlɪ)
1.  certainly or definitely; unquestionably: he is undoubtedly talented
2.  (sentence modifier) without doubt; certainly or indisputably: undoubtedly there will be changes

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1460, from un- (1) "not" + pp. of doubt (v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Universities undoubtedly will have concerns about such a program.
But it is undoubtedly more orderly-and less brutal-than it used to be.
Undoubtedly one reason is that, having been raised in this culture, they know
  little else.
Although some choice is undoubtedly better than none, more is not always better
  than less.
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