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

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

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