There are several synonyms for the phrase "not drinking", including abstaining, refraining, teetotaling, sober, and dry. Abstaining and refraining both convey a deliberate choice to not consume alcohol. Teetotaling refers to a lifestyle choice to never drink alcohol, often for moral or religious reasons. Sober and dry both imply a period of not drinking as part of a recovery process from alcohol addiction. Other phrases that can be used include "non-drinker", "non-alcoholic", and "alcohol-free". It's important to use the appropriate term depending on the context and reason for not drinking.