sober

The story

1. Proto-Indo-European · derived from*h₁egʷʰ-“drink”
2. Latin · derived fromsōbrius
3. Old French · derived fromsobre
4. Middle English · inherited fromsober
5. English todaysober

Inherited from Middle English sober, from Old French sobre, from Latin sōbrius, from se- (“without”) + ebrius (“intoxicated”), from Proto-Indo-European *h₁egʷʰ- (“drink”). In the sense "not drunk," displaced native undrunken, from Old English undruncen.