Cold sober is a phrase used to describe someone who is completely sober, not under the influence of alcohol or drugs. Antonyms for cold sober could include terms like intoxicated, drunk, tipsy or buzzed. These words all mean that the person has consumed alcohol, and their ability to function normally may be impaired. Additionally, the phrase "warmly intoxicated" could be considered an antonym for cold sober. This phrase may suggest that someone is feeling the effects of alcohol in a positive, relaxing way but is still able to function properly. As with all alcohol-related terms, it's important to use them in context and with discretion.