Definition of impossibilism in English:

impossibilism

noun

mass noun
  • Belief in ideas or policy, especially on social reform, that are held to be unrealizable or impractical.

    • ‘The most stratospheric flights of that speech exuded the utopian impossibilism which he attacked when practised by the self-indulgent Old Left.’

Pronunciation

impossibilism

/ɪmˈpɒsɪbɪlɪz(ə)m/