stone cold adjective 6adverb 1forms 4 adjective6 •Very cold (literally); lacking any semblance of warmth.I forgot to turn on the burner under the soup and found it sitting there, still stone cold, twenty minutes later. •Completely cold.By the time I returned to my desk, my tea was stone-cold. •Lacking emotion or compassion. •Without emotion.He was a stone-cold killer: he didn't flinch as he took the shot. •Certain; definite; obvious."A hike on Thursday looks a stone cold certainty," Howard Archer, chief UK economist at Global Insight, said. — 2006 •Absolute; incomparable.With an ace-high flush on an unpaired board, he had the stone-cold nuts. adverb1 •Certainly; definitely; obviously.It is stone cold guaranteed that that guy will get his clock cleaned if he shows up here today. formsmore stone cold · more stone-cold · most stone cold · most stone-cold