undrinkable 

英汉解释

adj. 不能喝的；不能饮用的

反义词

a.   drinkable，potable

参考例句

1. Flawed wines to avoid at all costs. Practically undrinkable.
有缺陷的酒，多少钱也不要买。简直不能喝。
2. The water has been treated (softened), but it is undrinkable water.
这水经过处理（软化），但不是饮用水。
3. London's streets were gridlocked, its riverside was drab, its food inedible and coffee undrinkable.
那时的伦敦，街道拥挤，河岸景色单调，没有可口的食物，连咖啡都让人难以下咽。

英英解释

adj.
  1. unsuitable for drinking

网络释义

undrinkable
不能饮用的; 不能喝的; 不能饮用;
undrinkable water
非饮用水;