different between undrinkable vs impotableimpotable

English

From un- +? drinkable

undrinkable (comparative more undrinkable, superlative most undrinkable)

undrinkable (plural undrinkables)

Anything not suitable for drinking.
- 1938, The National Review (volume 110, page 514)
  […] but there was a peculiar aroma about that Oxo that no ox had ever provided, unless he were stalled in a chemist's shop, and it was not long before this ruse was discovered and another liquid thereby added to the undrinkables of life.
- 2018, Craig Hallam, Old Haunts
  Popping down a cork coaster, the bartender delivered Alan's next drink and plucked the empties and undrinkables as the music changed.

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