You searched for: “unpotable
unpotable (adjective) (not comparable)
1. Not suitable for drinking: The old coffee is unpotable because it was made last week and won't be tasty anymore!
2. Not safe for, or not fit for, drinking: The water from the stream is unpotable and because it can contain unhealthy germs.
This entry is located in the following units: -able (page 40) poto-, pot- + (page 2)