stone-cold

adjective ! Definition from Wiktionary (CC BY-SA). More about stone-cold at Wordnik → Where our words come from →

1. Completely cold.

   By the time I returned to my desk, my tea was stone-cold.

2. Without emotion.

   He was a stone-cold killer: he didn't flinch as he took the shot.

3. Absolute; incomparable.

   With an ace-high flush on an unpaired board, he had the stone-cold nuts.