1. cold sober, stone-sober - totally sober
   Antonyms: intoxicated, drunk, inebriated (indirect, via sober)
   

1. completely sober; not drunk or under the influence of alcohol.

Example sentence: She remained stone-sober throughout the entire party, opting for sparkling water instead of champagne.

1. in a completely sober manner; without any influence of alcohol.

Example sentence: He drove stone-sober, ensuring his safety and the safety of others on the road.

1. to become completely sober; to cease being under the influence of alcohol.

Example sentence: After a night of heavy drinking, it took him hours to stone-sober up and feel normal again.

1. a person who is completely sober.

Example sentence: Among a group of intoxicated friends, he was the designated stone-sober responsible for making sure they all got home safely.