without the/a shadow of (a) doubt

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without the/a shadow of (a) doubt

With certainty; for sure. I only made such a big change in my life because I knew without the shadow of a doubt that it was the right thing for me to do.
See also: doubt, of, shadow, without
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

without a shadow of a doubt

 and beyond the shadow of a doubt
without the smallest amount of doubt. I am certain that I am right, without a shadow of a doubt. I felt the man was guilty beyond the shadow of a doubt.
See also: doubt, of, shadow, without
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

beyond/without a ˌshadow of (a) ˈdoubt

,

there isn’t a ˌshadow of a ˈdoubt (that...)

there is no doubt at all (that...); absolutely certainly: He’s innocent beyond a shadow of a doubt.There isn’t a shadow of doubt in my mind about the safety of the system.
See also: beyond, doubt, of, shadow, without
Farlex Partner Idioms Dictionary © Farlex 2017
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References in periodicals archive ?
A Shadow Of Doubt I recall with great pleasure the old first division Just maybe the premiership was the wrong decision Unbalanced teams in an imbalanced league Somewhat all sky have managed to achieve Our new stadiums are a dream But not a lot of our foreigners are the cream Only the very best foreigners should be allowed in the league Thus giving our youngers a chance to succeed The old system limiting foreigners in a side Would help bring back some lost English pride Without a shadow of doubt The foreign players rule still today needs sorting out GEORGE MCLANDERS, Byker
Consultant Francis Collins said he found there was extensive damage to almost all her vital organs, adding, "without a shadow of doubt she had no prospect of survival".