soberest
so-ber-est
adjective
Most free from the effects of alcohol, or most serious and sensible.
"She was the soberest of the group."
Thesaurus
Synonyms: unplayful, serious, sober, sober up, solemn, sedate, grave, teetotal, unintoxicated, drug-free, cold sober, stone-sober
Antonyms: drunk, gone, inebriated, intoxicated, playful, ripped