no doubt

no doubt idiom
  1. Probably, most likely, as in No doubt you've heard the news about Mother. [Early 1300s]
  2. Also, without doubt or a doubt. Certainly, without question, as in He's guilty, no doubt, but he doesn't deserve such a long sentence, or That basketball player is without doubt the tallest man I've ever seen. [Early 1300s] Also see beyond a doubt.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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