Undrinkable (adjective)

Not able to be consumed as a beverage; not fit for drinking.

Origin:

From un- (not) + drinkable (able to be consumed as a beverage).

Examples:

1. The water was undrinkable due to pollution.
2. The coffee was undrinkable because it was too bitter.
3. The milk was undrinkable because it had expired.
4. The wine was undrinkable because it was corked.
5. The tea was undrinkable because it was too cold.