stone sober

stone(–cold) sober

 and cold sober
absolutely sober. I am stone-cold sober, or I will be by morning anyway. I found the secret to waking up cold sober. Don't drink.
See also: sober, stone

stone sober

verb
See also: sober, stone
References in periodicals archive ?
And being stone sober, I was far more agile than he.
The problem with the job performance standard is that if Tower was an alcoholic he could have been stone sober during office hours and still had his judgment and temperament somewhat impaired by liquor.
He wasn't drunk but he certainly wasn't stone sober, either.
On guitar is Darren, who dodged each and every one of his juvenile sentences then went three years stone sober to escape a 15-year-run as an adult.