- impossibility, impossibleness - incapability of existing or occurring
--1 is a kind of nonexistence, nonentity
Antonyms: possibility, possibleness
--1 has particulars: inconceivability, inconceivableness; unattainableness - impossibility, impossible action - an alternative that is not available
--2 is a kind of option, alternative, choice
--2 has particulars: impossible