Not intoxicated or drunk. (Dictionary.com)
Habitually temperate, especially in the use of liquor. (Dictionary.com)
Quiet or sedate in demeanor, as persons. (Dictionary.com)
Not drunk or affected by alcohol: (Cambridge Dictionary)
When you are sober, you are not drunk. (Collins Dictionary)
A sober person is serious and thoughtful. (Collins Dictionary)
Not addicted to intoxicating drink. (Merriam – Webster)
Not drunk. (Merriam – Webster)
Eleven Things Sober People Want Normal Drinkers To Know.
Ten Reasons Sober People Are Attractive.