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Synonyms

undoubtedly

American  
[uhn-dou-tid-lee] / ʌnˈdaʊ tɪd li /

adverb

  1. certainly or definitely; without doubt.

    Seats will undoubtedly sell out fast for this one-night performance.


undoubtedly British  
/ ʌnˈdaʊtɪdlɪ /

adverb

  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" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of undoubtedly

First recorded in 1500–50; undoubted ( def. ) + -ly ( def. )

Explanation

Undoubtedly means certainly. If you are undoubtedly beautiful, then everyone agrees you are attractive. No one could think otherwise. There are a lot of things in life that people doubt. However, when you're sure of something or feel strongly about it, this is a handy word. A beautiful spring day is undoubtedly wonderful. Dogs undoubtedly love to chase squirrels. Adults undoubtedly love to drink coffee in the morning, and kids undoubtedly love to get a day off from school. You are undoubtedly aware that this is a long explanation for something as simple as this word.

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