Undrinkable : adj. Who is not drinkable.
Intolerable. This man is really undrinkable.
Quote from American writer Truman Capote, by birth name Truman Streckfus Persons (1924-1984): "Careless of the bacon that curled up in the pan and the coffee that had cooled until it was undrinkable, she poured the dough in a waffle iron that she had forgotten to grease", in her novel The crossing of summer (published posthumously in 2005).