without a doubt

Related to without a doubt: same old same old, wreak havoc, doubters

without a doubt

Absolutely or with absolute certainty; with no doubt whatsoever. This photo now proves, without a doubt, that my client is innocent. I barely remember leaving the office last night, so I can't say without a doubt that I set the alarm before I left. This is without a doubt the best movie of the year, perhaps even the decade.
See also: doubt, without
Farlex Dictionary of Idioms.

without a doubt

a phrase expressing certainty or agreement; yes. John: This cheese is as hard as a rock. It must have been in the fridge for weeks. Fred: Without a doubt. Mary: Taxes will surely go up before I retire. Jane: Without a doubt!
See also: doubt, without
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • beyond (a) doubt
  • beyond a doubt
  • without/beyond doubt
  • beyond a/the shadow of a doubt
  • without doubt
  • in doubt
  • beyond the/a shadow of (a) doubt
  • beyond/without a shadow of doubt
  • doubt
  • beyond a reasonable doubt