beyond (a) doubt
With confidence; without any doubt. This photo now proves, beyond doubt, that my client is innocent. I barely remember leaving the office last night, so I can't say beyond a doubt that I set the alarm before I left.
without doubt
With confidence; without any doubt. This photo now proves, without doubt, that my client is innocent. I barely remember leaving the office last night, so I can't say without doubt that I set the alarm before I left.